A mass of organic or inorganic solid fragmented material, or the solid fragment itself, that comes from the weathering of rock and is carried by, suspended in, or dropped by air, water, or ice. It refers also to a mass that is accumulated by any other natural agent and that forms in layers on the earth's surface, such as sand, gravel, silt, mud, fill, or loess. (McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed, p1689)
An acute infection caused by the RIFT VALLEY FEVER VIRUS, an RNA arthropod-borne virus, affecting domestic animals and humans. In animals, symptoms include HEPATITIS; abortion (ABORTION, VETERINARY); and DEATH. In humans, symptoms range from those of a flu-like disease to hemorrhagic fever, ENCEPHALITIS, or BLINDNESS.
A mosquito-borne species of the PHLEBOVIRUS genus found in eastern, central, and southern Africa, producing massive hepatitis, abortion, and death in sheep, goats, cattle, and other animals. It also has caused disease in humans.
A species of FLAVIVIRUS, one of the Japanese encephalitis virus group (ENCEPHALITIS VIRUSES, JAPANESE), found in Australia and New Guinea. It causes a fulminating viremia resembling Japanese encephalitis (ENCEPHALITIS, JAPANESE).
Water containing no significant amounts of salts, such as water from RIVERS and LAKES.
The salinated water of OCEANS AND SEAS that provides habitat for marine organisms.
The presence of bacteria, viruses, and fungi in water. This term is not restricted to pathogenic organisms.
Constituent of 30S subunit prokaryotic ribosomes containing 1600 nucleotides and 21 proteins. 16S rRNA is involved in initiation of polypeptide synthesis.
Large natural streams of FRESH WATER formed by converging tributaries and which empty into a body of water (lake or ocean).
Chemical compounds which pollute the water of rivers, streams, lakes, the sea, reservoirs, or other bodies of water.
The relationships of groups of organisms as reflected by their genetic makeup.
DNA sequences encoding RIBOSOMAL RNA and the segments of DNA separating the individual ribosomal RNA genes, referred to as RIBOSOMAL SPACER DNA.
One of the three domains of life (the others being Eukarya and ARCHAEA), also called Eubacteria. They are unicellular prokaryotic microorganisms which generally possess rigid cell walls, multiply by cell division, and exhibit three principal forms: round or coccal, rodlike or bacillary, and spiral or spirochetal. Bacteria can be classified by their response to OXYGEN: aerobic, anaerobic, or facultatively anaerobic; by the mode by which they obtain their energy: chemotrophy (via chemical reaction) or PHOTOTROPHY (via light reaction); for chemotrophs by their source of chemical energy: CHEMOLITHOTROPHY (from inorganic compounds) or chemoorganotrophy (from organic compounds); and by their source for CARBON; NITROGEN; etc.; HETEROTROPHY (from organic sources) or AUTOTROPHY (from CARBON DIOXIDE). They can also be classified by whether or not they stain (based on the structure of their CELL WALLS) with CRYSTAL VIOLET dye: gram-negative or gram-positive.
A functional system which includes the organisms of a natural community together with their environment. (McGraw Hill Dictionary of Scientific and Technical Terms, 4th ed)
Infections of the brain caused by arthropod-borne viruses (i.e., arboviruses) primarily from the families TOGAVIRIDAE; FLAVIVIRIDAE; BUNYAVIRIDAE; REOVIRIDAE; and RHABDOVIRIDAE. Life cycles of these viruses are characterized by ZOONOSES, with birds and lower mammals serving as intermediate hosts. The virus is transmitted to humans by the bite of mosquitoes (CULICIDAE) or TICKS. Clinical manifestations include fever, headache, alterations of mentation, focal neurologic deficits, and COMA. (From Clin Microbiol Rev 1994 Jan;7(1):89-116; Walton, Brain's Diseases of the Nervous System, 10th ed, p321)
The simplest saturated hydrocarbon. It is a colorless, flammable gas, slightly soluble in water. It is one of the chief constituents of natural gas and is formed in the decomposition of organic matter. (Grant & Hackh's Chemical Dictionary, 5th ed)
A multistage process that includes cloning, physical mapping, subcloning, determination of the DNA SEQUENCE, and information analysis.
Deoxyribonucleic acid that makes up the genetic material of bacteria.
Elimination of ENVIRONMENTAL POLLUTANTS; PESTICIDES and other waste using living organisms, usually involving intervention of environmental or sanitation engineers.
The continent lying around the South Pole and the southern waters of the Atlantic, Pacific, and Indian Oceans. It includes the Falkland Islands Dependencies. (From Webster's New Geographical Dictionary, 1988, p55)
A group of PROTEOBACTERIA represented by morphologically diverse, anaerobic sulfidogens. Some members of this group are considered bacterial predators, having bacteriolytic properties.
A group of gram-negative, anaerobic bacteria that is able to oxidize acetate completely to carbon dioxide using elemental sulfur as the electron acceptor.
The science of the earth and other celestial bodies and their history as recorded in the rocks. It includes the study of geologic processes of an area such as rock formations, weathering and erosion, and sedimentation. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed)
The variety of all native living organisms and their various forms and interrelationships.
One of the three domains of life (the others being BACTERIA and Eukarya), formerly called Archaebacteria under the taxon Bacteria, but now considered separate and distinct. They are characterized by: (1) the presence of characteristic tRNAs and ribosomal RNAs; (2) the absence of peptidoglycan cell walls; (3) the presence of ether-linked lipids built from branched-chain subunits; and (4) their occurrence in unusual habitats. While archaea resemble bacteria in morphology and genomic organization, they resemble eukarya in their method of genomic replication. The domain contains at least four kingdoms: CRENARCHAEOTA; EURYARCHAEOTA; NANOARCHAEOTA; and KORARCHAEOTA.
A partially enclosed body of water, and its surrounding coastal habitats, where saltwater from the ocean mixes with fresh water from rivers or streams. The resulting mixture of seawater and fresh water is called brackish water and its salinity can range from 0.5 to 35 ppt. (accessed http://oceanservice.noaa.gov/education/kits/estuaries/estuaries01_whatis.html)
A great expanse of continuous bodies of salt water which together cover more than 70 percent of the earth's surface. Seas may be partially or entirely enclosed by land, and are smaller than the five oceans (Atlantic, Pacific, Indian, Arctic, and Antarctic).
Genes, found in both prokaryotes and eukaryotes, which are transcribed to produce the RNA which is incorporated into RIBOSOMES. Prokaryotic rRNA genes are usually found in OPERONS dispersed throughout the GENOME, whereas eukaryotic rRNA genes are clustered, multicistronic transcriptional units.
Descriptions of specific amino acid, carbohydrate, or nucleotide sequences which have appeared in the published literature and/or are deposited in and maintained by databanks such as GENBANK, European Molecular Biology Laboratory (EMBL), National Biomedical Research Foundation (NBRF), or other sequence repositories.
Deoxyribonucleic acid that makes up the genetic material of archaea.
The presence of bacteria, viruses, and fungi in the soil. This term is not restricted to pathogenic organisms.
Inland bodies of still or slowly moving FRESH WATER or salt water, larger than a pond, and supplied by RIVERS and streams.
The monitoring of the level of toxins, chemical pollutants, microbial contaminants, or other harmful substances in the environment (soil, air, and water), workplace, or in the bodies of people and animals present in that environment.
Adverse effect upon bodies of water (LAKES; RIVERS; seas; groundwater etc.) caused by CHEMICAL WATER POLLUTANTS.
A plant family of the order Rhizophorales, subclass Rosidae, class Magnoliopsida, that includes mangrove trees.
Environments or habitats at the interface between truly terrestrial ecosystems and truly aquatic systems making them different from each yet highly dependent on both. Adaptations to low soil oxygen characterize many wetland species.
The complete absence, or (loosely) the paucity, of gaseous or dissolved elemental oxygen in a given place or environment. (From Singleton & Sainsbury, Dictionary of Microbiology and Molecular Biology, 2d ed)
The period of history before 500 of the common era.
Substances or organisms which pollute the water or bodies of water. Use for water pollutants in general or those for which there is no specific heading.
The Arctic Ocean and the lands in it and adjacent to it. It includes Point Barrow, Alaska, most of the Franklin District in Canada, two thirds of Greenland, Svalbard, Franz Josef Land, Lapland, Novaya Zemlya, and Northern Siberia. (Webster's New Geographical Dictionary, 1988, p66)
The relative amounts of the PURINES and PYRIMIDINES in a nucleic acid.
The inanimate matter of Earth, the structures and properties of this matter, and the processes that affect it.
Uranium. A radioactive element of the actinide series of metals. It has an atomic symbol U, atomic number 92, and atomic weight 238.03. U-235 is used as the fissionable fuel in nuclear weapons and as fuel in nuclear power reactors.
Contamination of bodies of water (such as LAKES; RIVERS; SEAS; and GROUNDWATER.)
Virus diseases caused by the BUNYAVIRIDAE.
The study of early forms of life through fossil remains.
The scientific study of past societies through artifacts, fossils, etc.
Arthropod-borne viruses. A non-taxonomic designation for viruses that can replicate in both vertebrate hosts and arthropod vectors. Included are some members of the following families: ARENAVIRIDAE; BUNYAVIRIDAE; REOVIRIDAE; TOGAVIRIDAE; and FLAVIVIRIDAE. (From Dictionary of Microbiology and Molecular Biology, 2nd ed)
Inorganic salts of sulfuric acid.
Substances which pollute the soil. Use for soil pollutants in general or for which there is no specific heading.
Ribonucleic acid in bacteria having regulatory and catalytic roles as well as involvement in protein synthesis.
A republic in eastern Africa, south of ETHIOPIA, west of SOMALIA with TANZANIA to its south, and coastline on the Indian Ocean. Its capital is Nairobi.
The enrichment of a terrestrial or aquatic ECOSYSTEM by the addition of nutrients, especially nitrogen and phosphorus, that results in a superabundant growth of plants, ALGAE, or other primary producers. It can be a natural process or result from human activity such as agriculture runoff or sewage pollution. In aquatic ecosystems, an increase in the algae population is termed an algal bloom.
The unconsolidated mineral or organic matter on the surface of the earth that serves as a natural medium for the growth of land plants.
The science dealing with the earth and its life, especially the description of land, sea, and air and the distribution of plant and animal life, including humanity and human industries with reference to the mutual relations of these elements. (From Webster, 3d ed)
Water particles that fall from the ATMOSPHERE.
Pollutants, present in water or bodies of water, which exhibit radioactivity.
A group of the proteobacteria comprised of facultatively anaerobic and fermentative gram-negative bacteria.
Industrial chemicals which have become widespread environmental pollutants. Each aroclor is a mixture of chlorinated biphenyls (1200 series) or chlorinated terphenyls (5400 series) or a combination of both (4400 series).
The flow of water in enviromental bodies of water such as rivers, oceans, water supplies, aquariums, etc. It includes currents, tides, and waves.
Metals with high specific gravity, typically larger than 5. They have complex spectra, form colored salts and double salts, have a low electrode potential, are mainly amphoteric, yield weak bases and weak acids, and are oxidizing or reducing agents (From Grant & Hackh's Chemical Dictionary, 5th ed)
A major group of unsaturated cyclic hydrocarbons containing two or more rings. The vast number of compounds of this important group, derived chiefly from petroleum and coal tar, are rather highly reactive and chemically versatile. The name is due to the strong and not unpleasant odor characteristic of most substances of this nature. (From Hawley's Condensed Chemical Dictionary, 12th ed, p96)
Domesticated farm animals raised for home use or profit but excluding POULTRY. Typically livestock includes CATTLE; SHEEP; HORSES; SWINE; GOATS; and others.
A nonmetallic element with atomic symbol C, atomic number 6, and atomic weight [12.0096; 12.0116]. It may occur as several different allotropes including DIAMOND; CHARCOAL; and GRAPHITE; and as SOOT from incompletely burned fuel.
Divisions of the year according to some regularly recurrent phenomena usually astronomical or climatic. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed)
A chemical reaction in which an electron is transferred from one molecule to another. The electron-donating molecule is the reducing agent or reductant; the electron-accepting molecule is the oxidizing agent or oxidant. Reducing and oxidizing agents function as conjugate reductant-oxidant pairs or redox pairs (Lehninger, Principles of Biochemistry, 1982, p471).
The spectrum of different living organisms inhabiting a particular region, habitat, or biotope.
Naturally occurring complex liquid hydrocarbons which, after distillation, yield combustible fuels, petrochemicals, and lubricants.
Liquid water present beneath the surface of the earth.
A republic in western Africa, southwest of ALGERIA and west of MALI. Its capital is Nouakchott.
An area of water mostly surrounded by land, usually smaller than a gulf, and affording access to the sea.
Chemical groups containing the covalent sulfur bonds -S-. The sulfur atom can be bound to inorganic or organic moieties.
A genus of the family BUNYAVIRIDAE comprising many viruses, most of which are transmitted by Phlebotomus flies and cause PHLEBOTOMUS FEVER. The type species is RIFT VALLEY FEVER VIRUS.
Organic, monobasic acids derived from hydrocarbons by the equivalent of oxidation of a methyl group to an alcohol, aldehyde, and then acid. Fatty acids are saturated and unsaturated (FATTY ACIDS, UNSATURATED). (Grant & Hackh's Chemical Dictionary, 5th ed)
Organic matter in a state of advanced decay, after passing through the stages of COMPOST and PEAT and before becoming lignite (COAL). It is composed of a heterogenous mixture of compounds including phenolic radicals and acids that polymerize and are not easily separated nor analyzed. (E.A. Ghabbour & G. Davies, eds. Humic Substances, 2001).
The study of the origin, structure, development, growth, function, genetics, and reproduction of organisms which inhabit the OCEANS AND SEAS.
A genus of mosquitoes (CULICIDAE) commonly found in tropical regions. Species of this genus are vectors for ST. LOUIS ENCEPHALITIS as well as many other diseases of man and domestic and wild animals.
A set of statistical methods used to group variables or observations into strongly inter-related subgroups. In epidemiology, it may be used to analyze a closely grouped series of events or cases of disease or other health-related phenomenon with well-defined distribution patterns in relation to time or place or both.
Remains, impressions, or traces of animals or plants of past geological times which have been preserved in the earth's crust.
The science, art or practice of cultivating soil, producing crops, and raising livestock.
A kingdom in the domain ARCHAEA comprised of thermoacidophilic, sulfur-dependent organisms. The two orders are SULFOLOBALES and THERMOPROTEALES.
An order of amoeboid EUKARYOTES characterized by reticulating pseudopods and a complex life cycle with an alternation of generations. Most are less than 1mm in size and found in marine or brackish water.
A phylum of bacteria consisting of the purple bacteria and their relatives which form a branch of the eubacterial tree. This group of predominantly gram-negative bacteria is classified based on homology of equivalent nucleotide sequences of 16S ribosomal RNA or by hybridization of ribosomal RNA or DNA with 16S and 23S ribosomal RNA.
A family of colorless sulfur bacteria in the order Thiotrichales, class GAMMAPROTEOBACTERIA.
Procedures for identifying types and strains of bacteria. The most frequently employed typing systems are BACTERIOPHAGE TYPING and SEROTYPING as well as bacteriocin typing and biotyping.
The branch of science concerned with the interrelationship of organisms and their ENVIRONMENT, especially as manifested by natural cycles and rhythms, community development and structure, interactions between different kinds of organisms, geographic distributions, and population alterations. (Webster's, 3d ed)
A genus of FLAVIVIRIDAE containing several subgroups and many species. Most are arboviruses transmitted by mosquitoes or ticks. The type species is YELLOW FEVER VIRUS.
Insects that transmit infective organisms from one host to another or from an inanimate reservoir to an animate host.
Sediments from the surrounding mountains filled the valley over geologic time periods. After lakes within the valley receded, ... Sediments from both mountain ranges filled the deep chasm of the valley, along with huge amounts of water from melting glaciers ... Sand that has blown from the valley floor is captured in streams and carried back toward the valley. As creeks disappear into ... American Indians and early settlers used this route for travel between the San Luis Valley and the Wet Mountain Valley to the ...
Both of these genera are present in the Titus Canyon Formation sediments of Death Valley National Park. "Death Valley National ... The Titus Canyon Formation is an Eocene geologic formation in California. H. Donald Curry collected the type specimens of the ...
Other sediments may have been added but, if they ever existed, were completely removed by erosion. Such gaps in the geologic ... Streams flowing through broad low valleys in Triassic time deposited sediment eroded from nearby uplands, creating the once ... Disconformities show erosional features such as valleys, hills and cliffs that are later covered by younger sediments. ... At the same time, sediment filled the lakes behind the dams. Sediment would fill a lake behind a 150-foot (46 m)-high dam in ...
Streams suffer raised sediment and nutrient (phosphorus) levels from flood irrigation and grazing. The High Idaho Batholith ... The glaciation of the region has resulted in geologic features such as jagged peaks, tarns, and rockland. Tarns are lakes that ... latifolia) and ponderosa pine originally grew in valley floors. Cold and snowy winters occur here. Large amounts of runoff from ... Fires help speed up the removal of vegetation from the soil, which in turn increases the rate of erosion and sediment transport ...
... such as the Potrero de la Aguada valley. Within the park's boundaries, five geologic formations of Lower Cretaceous age, as ... The basins began to be filled with fluvial and aeolian sediments, eroded from the highlands. The process lasted some 20 Ma, ... The Desaguadero River valley is below 500 m, while some peaks are above 900 m: Cerro El Portillo and Cerro El Lindo are below ... The geologic origin of the Quijadas is composed of three stages: infill, uplift and erosion. 120 mya, the present location of ...
This gallery explores the geologic sediments deposited to create the Bearpaw Formation and the Frenchman Formation and the ... The T.rex Discovery Centre opened in 2001 in the Frenchman River Valley, about 25 km southeast of Eastend. On February 14, 2013 ... Originally discovered by Royal Saskatchewan Museum research team in Saskatchewan's Frenchman River Valley on August 16, 1991, ... on a prospecting expedition alongside the Frenchman River Valley. Gebhardt stumbled across a tail vertebra of the T. rex on a ...
An arm of the sea entered and sediments accumulated. As time went on, this shallow sea transgressed westward. By the end of ... The life zones of West Virginia transitions from large low-land farming valleys bordered with forest and meadow to high-land ... Historical Geology Summary Prior to one billion years ago, the geologic history of West Virginia is obscure. Sometime between ... Other trees common in the state are the persimmon, sassafras, and, in the Ohio and Potomac Valley regions, the American ...
Another significant geologic feature of the Central Valley lies hidden beneath the delta. The Stockton Arch is an upwarping of ... the crust beneath the valley sediments that extends southwest to northeast across the valley. The Central Valley lies within ... Over the millennia, the valley was filled by the sediments of these same ranges, as well as the rising Sierra Nevada to the ... Central Valley Tourism Association CA Central Valley & Foothills, project area of the American Land Conservancy Great Valley ...
The Tulare Formation is a Pliocene to Holocene epoch geologic formation in the central and southern San Joaquin Valley of ... Its sediments consist mainly of unconsolidated deposits of clay, silt, sand, and gravel. Many freshwater fossils are preserved ... San Joaquin Valley, California, with a section on ground-water management considerations and use of texture maps"; Water- ... Chapter 22 of the Petroleum Systems and Geologic Assessment of Oil and Gas in the San Joaquin Basin Province, California; by ...
After measuring Celo Knob, Mitchell descended to the Cane River Valley to obtain advice from the valley's residents. Two local ... Weathering and minor geologic events in subsequent periods carved out the mountains. During the last Ice Age, approximately ... Mountains consist primarily of Precambrian gneiss and schists formed over a billion years ago from primordial sea sediments. ... The Blacks rise southward from the Little Crabtree Creek Valley in the north to the steep 6,327-foot (1,928 m) summit of Celo ...
Ubehebe Crater is another distinctive geologic feature and visual landmark in this northern section of the park. Saline Valley ... It is the light colored clay sediment forming the playa surface surrounding the dark grey Grandstand that creates its ... Geology of the Death Valley area Places of interest in the Death Valley area Category: Death Valley Category: Geography of Inyo ... north of Death Valley in the Cottonwood Mountains of Death Valley National Park, in Inyo County, California. The Grandstand ...
Overdeepened basins and valleys filled with sediment (termed tunnel valleys) are of particular interest to engineers, petroleum ... Overdeepening is exhibited across the range of glacially eroded geologic features. It is common to fjords, fjord lakes and ... They presently appear as dry valleys, lakes, seabed depressions, and as areas filled with sediment. If they are filled with ... A tunnel valley is a large, long, U-shaped valley originally cut under the glacial ice near the margin of continental ice ...
Wisconsin Valley, and Langlade lobes. These glacial lobes carved out deep valleys and deposited sediments up to 600 feet deep. ... Mudrey, M.G.; Brown, B.A.; Greenberg, J.K. (1982). Bedrock Geologic Map of Wisconsin (Map). University of Wisconsin Extension ...
The Sulak canyon is located in the central part of Dagestan, in the valley of the Sulak river, some 100 km away from ... The canyon is the result of erosion which exposes one of the most complete geologic columns on the planet. Within this natural ... site, sediments of the Cretaceous, Jurassic and Tertiary periods come to the surface, in each of which ancient fossils are ...
... in the Arpa River valley of Armenia. The sediments were deposited in an open marine setting at the northern edge of the Paleo- ... The Gnishik Formation is a geologic formation in Armenia, Azerbaijan and Iran. It preserves fossils dating back to the Wordian ... The sediments were deposited at the northern edge of the Paleo-Tethys Ocean. The formation is dated to the late Murgabian, ... The Gnishik Formation was first formally described by Arakelyan in 1964, based on a section in the Gnishik River valley, after ...
... is a geologic feature that overlooks Bear Valley in Colusa County, California. The Buttes are approximately ... The Buttes are composed from the upturned marine sediments of the Great Valley Sequence that once formerly made up the floor of ... "Walker Ridge, Bear Valley". velovecchio.com. Retrieved 2017-05-05. "Bear Valley Buttes Topo Map, Colusa County CA (Leesville ...
As a geologic simplification, the western half of the state is characterised as being a more ancient fold province and the east ... Valleys with high rainfall and low soil fertility may be dominated by conifers Lagarostrobos and Phyllocladus, respectively. ... and Cambrian sediments. The extensive folding of these rocks (particularly the quartzite) formed jagged mountain ranges and ... Other more recent geologic signatures are scattered across the west, such as Ordovician limestone, Neoproterozoic dolomite ...
ISBN 0-231-13040-6. p. 124 Irvine Valley College: the geologic history of Orange County Archived 2008-11-21 at the Wayback ... Sediments continued to accrete, but now they were mixed with the shells of near-shore creatures, similar to those in modern ... The geologic unit which resulted from deposition in this environment, and which follows the Sespe in lithologic sequence, is ... ISBN 0-02-350042-5 Minor, S.A., Kellogg, K.S., Stanley, R.G., Gurrola, L.D., Keller, E.A., and Brandt, T.R., 2009, Geologic Map ...
... and valleys can have an accumulation of sediments and nutrients versus plateaus and ridges. But the most important topographic ... "Geologic Context and History of the San Joaquin Valley", QUEST (blog), http://science.kqed.org/quest/2010/08/12/geologic- ... oceanic crust-like Coastal Range sediment and the mineral-rich granitic Sierra sediment. The combination creates very fertile ... The basin and valley were made from volcanic eruption 40 million years ago, and the underlying rock is made primarily of ...
Sediments worn off the Death Valley region were shed both east and west and carried by wind and water; the eastern sediments ... ISBN 978-0-87842-362-0. Proceedings on Conference on Status of Geologic Research and Mapping, Death Valley National Park ... Panamint Valley and surrounding ranges. These valleys partially filled with sediment and, during colder periods during the ... These sediments were lithified into limestone and dolomite after they were buried and compacted by yet more sediment. Thickest ...
... s on Mars demonstrate that much of the eolian erosion is recent since they are sculpted in young geologic units. ... Depressions in a sand dune ecosystem caused by the removal of sediments by wind Dune - A hill of loose sand built by aeolian ... some individual ridges are tens of kilometers long with intervening valleys nearly 1 km wide. Yardangs on Mars are typically ... and carry an abrasive sediment load. The wind cuts down low-lying areas into parallel ridges which gradually erode into ...
122.00 The Tassajara Formation is a geologic unit within the Livermore Valley of Northern California, United States. The ... The Tassajara Formation consists of sediments ranging from brown to gray mudstone, andesitic sandstone, conglomerate, and minor ... Arroyo de la Laguna Arroyo Valle Arroyo Mocho Mocho Subbasin South San Ramon Creek Graymer, R.W. (2000). "Geologic Map and Map ... In the northern San Ramon area, the Tassajara Formation underlies Quaternary valley fill material. The Bishop Subbasin is an ...
Prior to the 1991 eruption, studies of geologic formations and sediments of Mapanuepe Valley showed that the area was the site ... The rising waters submerged the Mapanuepe Valley including the barangays of Aglao (lower), Buhawen and Pili of San Marcelino, ... Lahars following the eruption blocked the drainage of Mapanuepe River, south of the volcano, flooding Mapanuepe Valley together ...
An unconformity separates the Brule from the overlying Gering Formation, composed of fluvial sediments. Next in the geologic ... and the river valley in between. Developers built various trails up the bluff over the years, but most were precarious and ... Graham, J. (2009). "Scotts Bluff National Monument Geologic Resources Inventory Report Natural Resource Report NPS/NRPC/GRD/NRR ... Pabian, Roger; Swinehart II, James (1979). Geologic History of Scotts Bluff National Monument. Lincoln: University of Nebraska ...
Unconsolidated to poorly cemented alluvial materials that have accumulated as valley-filling sediments in major river valleys ... The volume of groundwater in an aquifer can be estimated by measuring water levels in local wells and by examining geologic ... In the first half of the 20th century, the San Joaquin Valley experienced significant subsidence, in some places up to 8.5 ... In the San Fernando Valley of California, real estate contracts for property transfer below the Santa Susana Field Laboratory ( ...
Other suggested derivations are from the Celtic donne meaning valley, hence beautiful valleys, or indo-European bal, meaning ... It initiated as a Paleozoic peneplain which was covered by Mesozoic sediments, then raised and tilted during the Tertiary ... As a result of its geologic history, Belledonne alternates jagged peaks with gentle slopes. Belledonne overlooks the fairly ... The highest point is the Grand Pic de Belledonne, 2,977 m (9,767 ft). The range is delineated by several valleys which lie at ...
... is believed to be a triangular graben valley, bordered by geologic faults on almost all sides. The bedrock ... Thus a major portion of the valley floor actually lies on a large alluvial fan formed by Robinson Creek sediment deposits to ... above the valley floor. Numerous peaks exceeding 10,000 feet (3,000 m) in height border the valley within a few miles on the ... The valley is 10 miles (16 km) long and 7.5 miles (12.1 km) wide, and is used primarily for ranching. The East Walker River is ...
Water held in permeable ground Ismenius Lacus quadrangle Lineated valley fill - Martian geologic feature List of areas of chaos ... When ground water surfaces in low areas containing sediments, water evaporates in the thin atmosphere and leaves behind ... The material comprising these valley floors is called lineated valley fill. In some of the best images taken by the Viking ... There is great deal of evidence that water once flowed in river valleys on Mars. Pictures from orbit show winding valleys, ...
... which separates Pleasant Valley and Coalinga from Interstate 5 and the main part of the San Joaquin Valley. The anticline in ... Most of the oil in the Coalinga field comes from a large-scale geologic formation known as the Kregenhagan-Temblor petroleum ... system, a body of Eocene-age shales rich in organic sediments. Oil in the field is found in both structural traps such as ... and the agricultural Pleasant Valley inside. The oil field is mainly on the high ground around the valley, with the western ...
The Rattlesnake Formation is a Miocene to late Pliocene geologic formation found along the John Day River Valley of Oregon, in ... The unit is composed of up to 700 feet of fanglomerate and finer terrestrial sediments and a 40-foot thick ignimbrite unit ... Bull., v. 2, p. 269-314 Geologic Formations of Eastern Oregon (East of longitude 121°30'), 1972. John D. Beaulieu. Bulletin 73 ... The formation is described in Geologic Formations of Eastern Oregon (1972) as follows: ...
crystallization during diagenesis of sediments. *formation by oxidation and weathering of rocks exposed to the atmosphere or ... Valley, J. W. (24 June 2011). "Needs and opportunities in mineral evolution research". American Mineralogist. 96 (7): 953-963. ...
The valley is more than 25 km in length and 6 km in average width. The slopes of the valley are covered with wild pine, oak and ... It was also during this geologic era that an ocean shift took place, causing the present-day location of the mountains to be ... In the mid Paleozoic era (between 360 and 290 mya), an initial substratum of ancient granites and sediments started bending and ... Valle (valley) de la Fuenfría. An eastern valley situated nearby the City of Cercedilla (Community of Madrid) featuring one of ...
Glacial valley: a depression carved by erosion by a glacier.. *River valley: a depression carved by fluvial erosion by a river. ... Sedimentary basin: in sedimentology, an area thickly filled with sediment[1] in which the weight of the sediment further ... "Dictionary of Geologic Terms - K". US Geochemical. Retrieved 2017-09-09.. *^ "Glossary of Important Terms in Glacial Geology - ... Graben or rift valley: fallen and typically linear depressions or basins created by rifting in a region under tensional ...
Cavosie, A. J.; J. W. Valley, S. A., Wilde & E.I.M.F. (July 15, 2005). "Magmatic δ18O in 4400-3900 Ma detrital zircons: A ... "Geologic Time: Radiometric Time Scale". U.S. Geological Survey. Archived from the original on September 21, 2008. Retrieved ... These lagerstätten allow paleontologists to examine the internal anatomy of animals that in other sediments are represented ... to a rapid increase in knowledge about the history of life on Earth and to progress in the definition of the geologic time ...
The angle of the sun in winter warmed the masonry of the cliff dwellings, warm breezes blew from the valley, and the air was ... Its sediments are approximately 400 feet thick, and its upper layers feature fossiliferous invertebrates.[105] ... Wheeler Geologic. *White Rocks. *Williams Creek. *Yanks Gulch/Upper Greasewood Creek Natural Area ... and the Rio Grande Valley. Later, Archaic people established semi-permanent rockshelters in and around the mesa. By 1000 BCE, ...
"Geologic Map Legends : Allegheny Plateau and Valley and Ridge". Geologic Map of Maryland. Maryland Geological Survey. 1968. ... Smol, J. P.; Last, William M. (2001). Tracking environmental change using lake sediments. Vol. 2: Physical and Geochemical ... Geologic cross section of upper to middle Devonian strata from Cherry Valley, New York southwest across the Allegheny Plateau ... Paleozoic Sedimentary Successions of the Virginia Valley & Ridge and Plateau. *^ a b c d Milici, Robert C.; Swezey, Christopher ...
Debris flows move as granular flows down steep mountain valleys and washes. Because they transport sediment as a granular ... Geologic principles and processes. Stratigraphic principles. *Principle of original horizontality. *Law of superposition ... In this equation ws is the sediment settling velocity, g is acceleration due to gravity, and D is mean sediment diameter. ν. {\ ... "Lecture 21-Suspended Sediment Transport" (PDF). Lecture Notes: Fluvial Sediment Transport. Kent State. Retrieved 25 December ...
Paleomagnetism: Magnetic domains to geologic terranes. Blackwell. ISBN 978-0-86542-070-0. . Archived from the original (PDF) on ... and found that the floor of the seabed beneath the layer of sediments consisted of basalt, not the granite which is the main ... such as Africa's East African Rift and Valley and the Red Sea), are examples of divergent boundaries. ... and that most geologic features such as basin development and mountain ranges could be explained by vertical crustal movement, ...
Generalized Geologic Map of Louisiana, 2008. *Generalized Geology of Louisiana (text to Generalized Geologic Map of Louisiana) ... In between the Tertiary rocks of the north, and the relatively new sediments along the coast, is a vast belt known as the ... The Plaquemine culture in the lower Mississippi River Valley in western Mississippi and eastern Louisiana began in 1200 CE and ... Bernard, Lafourche, the modern Mississippi, and now the Atchafalaya.[16] The sediments were carried from north to south by the ...
There are the slow geomorphological changes associated with the geologic processes that cause tectonic uplift and subsidence, ... or shifting sediment exposes new areas for colonisation. Another cause of disturbance is when an area may be overwhelmed by an ... marine snow drifts down from the surface layers of the sea and accumulates in this undersea valley, providing nourishment for ...
Rivers cut valleys into the plateau, following folds in the rocks. Rock have been broken off of the slopes, forming rocky sides ... Near these sediments late Oligocene to early Miocene granite and granodiorite intrusive bodies occur. A possible cause of this ... "Geologic transect across the northern Sierra Madre Occidental volcanic field, Chihuahua and Sonora, Mexico" (PDF). GSA. ... The high plateau that is formed by the range is cut by deep river valleys. This plateau is formed from volcanic rock overlying ...
Probably occurring because of a large landslide on the south shore of the bay in the Mudslide Creek Valley, the wave had a ... The displaced water and the displacement and folding of the sediments broke and uplifted 1,300 feet of ice along the entire ... Moore, J.G. (1964). "Giant Submarine Landslides on the Hawaiian Ridge". US Geologic Survey: D95-8. Professional Paper 501-D.. ... Along North Shore to Halawa Valley, Molokai" (PDF). National Park Service. 2001. Retrieved 2020-06-29.. ...
Geologic cross section of Kittatinny Mountain. This cross section shows metamorphic rocks, overlain by younger sediments ... Main articles: History of Earth and Geologic time scale. The geologic time scale encompasses the history of the Earth.[10] It ... "Surficial Geologic Maps" in New Hampshire Geological Survey, Geologic maps. des.nh.gov ... Geologic materials[edit]. The majority of geological data comes from research on solid Earth materials. These typically fall ...
John W. Valley, William H. Peck, Elizabeth M. King, Simon A. Wilde; Peck; King; Wilde (2002). "A Cool Early Earth". Geology. 30 ... Because zircons can survive geologic processes like erosion, transport, even high-grade metamorphism, they contain a rich and ... Zircon is a part of the ZTR index to classify highly-weathered sediments. ... Cavosie, A.J.; Valley, J.W.; Wilde, S.A.; e.i.m.f (2005). "Magmatic δ18O in 4400-3900 Ma detrital zircons: A record of the ...
Love, J.D. (1971). Creation of the Teton Landscape: The Geologic Story of Grand Teton National Park. The Paleozoic Era. Moose, ... Their sediment came from rock eroded from a mountain chain east of the seaway interbeded with ash from volcanos west of the ... Smaller moraines from a less severe part of the Pinedale were formed just below the base of each large valley in the Teton ... Love, J.D. (1971). Creation of the Teton Landscape: The Geologic Story of Grand Teton National Park. Precambrian Rocks - The ...
... ( /ɪˈvæpəraɪt/) is the term for a water-soluble mineral sediment that results from concentration and crystallization ... Thick halite deposits are expected to become an important location for the disposal of nuclear waste because of their geologic ... Example environments at the present that match this is the Denakil Depression, Ethiopia; Death Valley, California ... The inflow also has to occur in a closed basin, or one with restricted outflow, so that the sediment has time to pool and form ...
When upon death the ammonites fell to this seafloor and were gradually buried in accumulating sediment, bacterial decomposition ... "valleys" which point away from the aperture). The suture line has four main regions. The external or ventral region refers to ... and it is often possible to link the rock layer in which a particular species or genus is found to specific geologic time ... and it is often possible to link the rock layer in which they are found to specific geologic time periods. ...
Missouri Geology - Three Billion Years of Volcanoes, Seas, Sediments, and Erosion, University of Missouri Press, 1992. ISBN 0- ... Summits can reach elevations of just over 2,560 feet (780 m) with valleys 500 to 1,550 feet (472 m) deep (150 m to 450 m). ... The Salem Plateau, named after Salem, Missouri, makes up the largest geologic area of the Ozarks. The second largest is the ... The Boston Mountains portion of the Ozarks extends north of the Arkansas River Valley 20 to 35 miles (32 to 56 km) and is ...
Hattie Caldwell Davis, Cataloochee Valley: Vanished Settlements of the Great Smoky Mountains (Alexander, N.C.: Worldcomm, 1997 ... Geologic Map of the Great Smoky Mountains National Park Region, Tennessee and North Carolina United States Geological Survey ... By the end of the Paleozoic era, the ancient ocean had deposited a thick layer of marine sediments which left behind ... I (Norris, Tenn.: Tennessee Valley Authority, 1987), 1240-1246.. *^ Tennessee Historical Commission Marker IC-69, "The McMahan ...
The lower reaches of the ancestral river passed through a valley near where Mount Hood later arose. Carrying sediments from ... "The Geologic Story of the Columbia Basin". Bonneville Power Administration. Retrieved June 20, 2017.. ... periodic inundation of the lower Columbia River Plateau deposited rich sediments; 21st-century farmers in the Willamette Valley ... The trench is a broad, deep, and long glacial valley between the Canadian Rockies and the Columbia Mountains in BC. For its ...
On the other hand, the lack of coal may simply reflect the scarcity of all known sediments from the Early Triassic. Coal- ... Dolenec T, Lojen S, Ramovs A (2001). "The Permian-Triassic boundary in Western Slovenia (Idrijca Valley section): ... forming the boundary between the Permian and Triassic geologic periods, as well as between the Paleozoic and Mesozoic eras. It ... Their abundance in sediments from the P-T boundary indicates hydrogen sulfide was present even in shallow waters. ...
It uses evidence from ice sheets, tree rings, sediments, coral, and rocks to determine the past state of the climate. It ... J1.10 A preliminary back-trajectory and air mass climatology for the Shenandoah Valley (Formerly J3.16 for Applied Climatology ... paleoclimates are inferred from proxy variables that include non-biotic evidence such as sediments found in lake beds and ice ...
Typically, the sediment consists of either sand, gravel, or a combination of both. The sediment comprising some point bars ... In that case the valley index is the meander ratio of the valley while the channel index is the meander ratio of the channel. ... ultimately on the characteristics of the flow but the parameters are independent of it and apparently are caused by geologic ... A stream bed following a tilted valley. The maximum gradient is along the down-valley axis represented by a hypothetical ...
The major subdivisions of the Three-age Stone Age cross two epoch boundaries on the geologic time scale: *The geologic Pliocene ... shifts to the Jordan Rift Valley, an extension of the East African Rift Valley (the east bank of the Jordan is slowly sliding ... During the most recent part of the period, sediments (such as clay) were used to make pottery. Agriculture was developed and ... The mountains of Italy are rising at a rapid rate in the framework of geologic time; at 1.6 mya they were lower and covered ...
Greeley, R. et al. (1992). Martian Aeolian Processes, Sediments, and Features in Mars, H.H. Kieffer et al., Eds. University of ... Global Geologic Context for Rock Types and Surface Alteration on Mars. Geology, 32, pp. 645-648. ... Lineated valley fill (LVF). *Lobate debris apron. *North Polar Basin. *Ocean hypothesis ... Greeley, R. et al. (1992). Martian Aeolian Processes, Sediments, and Features in Mars, H.H. Kieffer et al., Eds. University of ...
"Methow Valley News. Retrieved March 12, 2016.. *^ Ben Goldfarb (November 9, 2015). "The beaver whisperer". High Country News. ... From streams in the Maryland coastal plain to Lake Tahoe, beaver ponds have been shown to remove sediment and pollutants, ... Ruedemann, Rudolf & Schoonmaker, W. J. (December 2, 1938). "Beaver-Dams as Geologic Agents". Science. 88 (2292): 523-525. ... "Methow Valley News. January 23, 2016. Retrieved March 12, 2016.. *^ Ann McCreary (January 24, 2016). "Beavers may be part of ...
Butler, Robert F. (1992). "Applications to paleogeography". Paleomagnetism: Magnetic domains to geologic terranes (PDF). ... and found that the floor of the seabed beneath the layer of sediments consisted of basalt, not the granite which is the main ... such as Africa's East African Rift and Valley and the Red Sea), are examples of divergent boundaries. ... and that most geologic features such as basin development and mountain ranges could be explained by vertical crustal movement, ...
Sediments worn off the Death Valley region were shed both east and west and carried by wind and water; the eastern sediments ... Proceedings on Conference on Status of Geologic Research and Mapping, Death Valley National Park ... Collier, Michael (1990). An Introduction to the Geology of Death Valley. Death Valley, California: Death Valley Natural History ... Panamint Valley and surrounding ranges. These valleys partially filled with sediment and, during colder periods during the ...
Some regions on Earth, such as the Pilbara in Western Australia and the McMurdo Dry Valleys of Antarctica, are also considered ... Heisinger, H.; Head, J. (2002). "Topography and morphology of the Argyre basin, Mars: implications for its geologic and ... "High rates of microbial carbon turnover in sediments in the deepest oceanic trench on Earth". Nature Geoscience. 6 (4): 284-288 ...
Central Valley[edit]. The entire Sacramento and San Joaquin valleys were inundated. An area about 300 miles (480 km) long, ... "U. S. Geologic Water Supply.. *^ "California Historical Landmark: Ventura County". Office of Historic Preservation. California ... Full of sediment, it covered the oyster beds.[10] One-quarter of California's estimated 800,000 cattle were killed by the flood ... The city of Sacramento suffered the worst damage due to its levee, which lay in a wide and flat valley at the junction of the ...
Once the emigrants moved out of the valley, the bluff formations forced the travelers to look for a pass to allow them to move ... These included a wide variety of sedimentary structures, diagenetic features, trace fossils and volcaniclastic sediments. ... Geological Survey made the first formal geologic investigation of the area. Geologic publications relating to Scotts Bluff ... This north face of Scotts Bluff has exposed the most geologic history of any location in the state of Nebraska. Visitors can ...
With up to 40 cm thickness the zones of AOM activity were unusually large and occurred in deeper sediment horizons (20-50 cm ... With up to 40 cm thickness the zones of AOM activity were unusually large and occurred in deeper sediment horizons (20-50 cm ... Mesophilic, methane-fueled ecosystems in shallow-water permeable sediments may comprise distinct microbial habitats due to ... and has mainly been investigated in deep-sea sediments. Here we studied methane seepage at four spots located at 12 m water ...
Sediment has since filled much of the channel, forming the shallow Bay.. But the story of the geologic forces that shaped the ... By 10,000 years ago, the main channel of the ancient Susquehanna River valley was flooded and became a narrow estuary. Between ... Sediments eroded from higher elevations into the low-lying areas created as the Atlantic Ocean opened. The sediments draped ... Rivers transport sediments and deposit them at the mouths of tributaries and along margins of the Bay, forming broad, flat ...
These sediments have formed over a period of numerous geologic time periods. As the lakes that are found within the valley had ... The San Luis Valley wherein the Great Sand Dunes National Park belongs to have a history of human habitation that goes back to ... The maximum height of the sand dunes is 750 feet (from the San Luis Valley floor). Some portions of the dunes contain a dark ... The Great Sand Dunes National Park was established to conserve the sand dunes on the eastern edge of San Luis Valley which are ...
Bernard delta complex and other subdeltas from the Mississippi River valley. Deltaic sediments enclosed the Pontchartrain Basin ... geochemical data to develop a geologic history and record of sediment distribution of the basin (Fig. 1, Fig. 2). ... Holocene sediments in Lake Pontchartrain were differentially deposited to the north (~0.3 m thick; Fig. 5 and Fig. 8) and south ... 7). As the basin flooded, the first sediment unit began to accumulate in topographic lows in the west-central part of the lake ...
Nearly 4,000 years ago, a landslide sent boulders and sediment tumbling into a valley of the Yellow River. The carnage created ... The site was caked with a distinctive black sand unlike the sediments nearby-and Wu noted that the sediments must have washed ... Geologic Evidence May Support Chinese Flood Legend. A deluge that washed down the Yellow River nearly 4,000 years ago could be ... If correct, the geologic evidence provides a kernel of truth to one of the countrys most important legends: a great flood that ...
Jackson has determined that in the recent geologic past there was a deep valley between Burnaby Mountain and central Coquitlam ... The cores record sediments associated with at least the last glacial cycle, and possibly earlier ones. He is eagerly awaiting ... While running a hand over a core, he points to a section of broken sediment that was likely caused by the passage of glacial ...
Mapping sedimentation features in an alluvial valley Sediments of the Rhone river are characterized by strong heterogeneity ... With the interpreted data it was possible to map different geologic units to a depth of up to 4.5m. ... ... Each site exhibits a unique geologic condition, contaminant concentration, enhancement application, and remediation goal. Based ... Wastes fill in a V-shaped valley of a stream (Fig. 1). The ... ...
50,000 years ago is preserved in the geologic record in the Las Vegas Valley, Nevada. Note that the green-colored sediments are ...
Towards the end of the last Ice Age, the Stillaguamish River Valley was a giant lake, blocked in by a glacier. It filled with ... "Its public, but whether it gets disseminated to the people who make land-use decisions and planning for geologic hazards ... soft lake sediments - sand, clay, gravel, material that falls apart when its wet. ... "The Stillaguamish setting, the geologic units, are particularly sensitive relative to say a real solid granite bedrock ...
... in combination with the occurrence from time to time of overbank flow in flat-bottomed valleys, have promoted intensive study ... Streamflow and sediment yield: Rapid variations of water-surface level in river channels through time, ... In a geologic context, this may be a temporary resting place; sediment, for example, when it reaches the coast, may be ... Sediment yield and sediment load*Measurement of the load. *Sources of sediment and nature of deposition*Erosion in drainage ...
Assessment of the Alluvial Sediments in the Big Thompson River Valley, Colorado [USGS-DDS-066] To obtain subsurface geologic ... Lead-rich sediments, containing at least 1000 ppm of lead (Pb), and derived mainly from discarded mill tailings in the Coeur ... These data consist of a number of subsets of soil samples gathered from the upper Garwood Valley in January 2002, January 2003 ... These data consist of a number of subsets of soil samples gathered from the Wright Valley in January 2006. Replicate randomly- ...
Sediments worn off the Death Valley region were shed both east and west and carried by wind and water; the eastern sediments ... Proceedings on Conference on Status of Geologic Research and Mapping, Death Valley National Park ... Collier, Michael (1990). An Introduction to the Geology of Death Valley. Death Valley, California: Death Valley Natural History ... Panamint Valley and surrounding ranges. These valleys partially filled with sediment and, during colder periods during the ...
Unlike the Willamette Valley, the bedrock geology was not buried under hundreds of feet of sediments. The result is a complex ... These soils are associated with two very different, albeit related, geologic processes. The volcanic soils in the north Rogue ... Moving from north to south, those AVAs are: the Elkton, Red Hill, Umpqua Valley, Rogue Valley and Applegate Valley. The Elkton ... The Willamette Valley, in particular, has gained worldwide fame for its pinot noir. The valley has certainly become the center ...
Geologic nitrogen: A potential geocehmical hazard in the San Joaquin Valley, California. J. Environ. Qual. 9:54-60. Warner, K.L ... N in fresh water comes from watersheds, soils and sediments of the receiving water bodies, from direct deposition of N from the ... For example, NO3-N in surface waters can diffuse into underlying anoxic water layers or underlying anoxic sediments. In such ... Dynamic Modeling and Monitoring of Water, Sediment, Nutrients, and Pesticides in Agricultural Watersheds during Storm Events. ...
Elevated foliar N in both Andean valley and lowland floodplain forest canopies is associated with high-fertility sediment ... Foliar N hotspots (,3.0% N) were found in forest canopies on: (i) substrates uplifted northeast of the geologic feature known ... 2, b); (iii) valleys in the eastern Andean foothills (Fig. 2, c); and (iv) relatively high-fertility substrates in the far ... 2, g). Close inspection of this region revealed localized hotspots of P in Andean valley bottoms as well as within erosional ...
A significant geologic feature is the sediment-filled Mississippi Embayment, which is indicated by the contours of sediment ... such as in river valleys and sediment-filled basins. This research will assess physics-based parameters that account for ... Site response occurs when seismic waves are modified by shallow geologic layers and can result in additional damage from strong ... Their project, Improving Estimates of Ground-Motion Site Response in the New Madrid and Wabash Valley Seismic Zones, will ...
Another significant geologic feature of the Central Valley lies hidden beneath the delta. The Stockton Arch is an upwarping of ... Over the millennia, the valley was filled by the sediments of these same ranges, as well as the rising Sierra Nevada to the ... "Central Valley". Geographic Names Information System. United States Geological Survey.. *^ "Californias Central Valley: ... The Central Valley has been home to many country, funk, jazz, soul, nu metal, and doo-wop musicians. The Valley has many ...
C, Kaw Valley in northwestern Douglas County; view from Mile 43 on the Kansas Turnpike. D, Osage Cuesta country along U.S. ... Most of the tilting developed after deposition of Permian sediments. In eastern Kansas, remnants of three or more alluvial ... Incompleteness of the Kansas Geologic Record. The understanding of geologic history depends on preservation and interpretation ... Geologic Time and Maximum Thickness of Rocks It is now possible by radioactivity to determine with reasonable accuracy the age ...
Several specialized programs comprise the UGS: Energy & Minerals, Geologic Hazards, Geologic Information & Outreach, Geologic ... Gandy Warm Springs can also be accessed from the north, via the towns of Trout Creek and Partoun on the Snake Valley Road; ... Alternatively, the springs could flow from sediments containing groundwater that is forced to the surface by the bedrock ... Geologic Information:. The source of water for Gandy Warm Springs is the northern Snake Range and perhaps locales farther west ...
... sediment-filled basins that are concealed beneath the young sedimentary deposits that make up the valley floor. Though hidden, ... Some geologic observations that did not make sense to geologists at first are explained now that we know about the hidden older ... Santa Clara Valley is bounded on the west and east by active faults of the San Andreas fault system, that broad zone of faults ... On both sides of the valley, these faults are on top of older faults, earlier parts of the San Andreas system. Movement on the ...
T.J. Stunkel examines sediments at the bottom of a fault valley in the Pine Ridge ... There are few faults mapped, but recent studies of lineaments point to many more unmapped geologic structures. This study was ... A clastic dike approximately 1 cm thick containing sandy sediments cuts the bedrock. The dike sediments are laminated parallel ... The studied deposit stands out because it is at the intersection of two flat bottom, steep sided valleys. Flat bottomed, steep ...
Assessment of the Alluvial Sediments in the Big Thompson River Valley, Colorado [USGS-DDS-066] To obtain subsurface geologic ... To obtain subsurface geologic information about the alluvium in the Big Thompson River Valley, S-wave refraction data were ... Assessment of the Alluvial Sediments in the Big Thompson River Valley, Colorado - USGS_DDS-66 [USGS_DDS-66] ... This geologic map was prepared as part of a study of digital methods and techniques as applied to complex geologic maps. The ...
Assessment of the Alluvial Sediments in the Big Thompson River Valley, Colorado [USGS-DDS-066] To obtain subsurface geologic ... wave refraction data were collected along three roads that cross the valley. The traveltimes were ... ... information about the alluvium in the Big Thompson River valley, S - ... lakes of the McMurdo Dry Valleys were ... ...
Erosion creates many geologic structures such as canyons, mesas, and hanging valleys. ... Igneous and sedimentary rocks may be thrust deeply into the Earth by tectonic movements or just accumulate as sediments over ... Many scientists believe that we have begun a new geologic era, called the Anthropocene, because humans are changing Earth on a ... The US Geological Survey webpage on Rocks provides explanations of geologic processes. Rock types are explained and a simple ...
The diagenesis of amino acids in sediments from Clear Lake core CL-80-1 is indicated by changes in amino acid concentrations, ... Quaternary deposits and soils in and around Spanish Valley, Utah Soils and Quaternary Geology of the Southwestern United States ... Late Cenozoic Drainage History of the Southwestern Great Basin and Lower Colorado River Region: Geologic and Biotic ... Amino-acid diagenesis and its implication for late Pleistocene lacustrine sediment, Clear Lake, California Author(s) ...
The geologic setting of the Ziegler Reservoir fossil site is somewhat unusual - the sediments containing the Pleistocene ... such as the Matanuska Valley. The source of loess in the Matanuska Valley has been debated for more than seven decades, with ... deposits exposed in and around the Las Vegas Valley in southern Nevada. Nearly monolithologic bedrock surrounds the valley, ... Geologic Records of High Sea Levels This project studies past high sea levels on coastlines that preserve fossil coral reefs or ...
Quaternary Sediments).. Alluvial deposits. (Quaternary) at surface, covers , 0.1 % of this area. Deposits in valleys consisting ... Geologic units in Minidoka county, Idaho. Additional scientific data in this geographic area ...
  • Most of the tilting developed after deposition of Permian sediments. (ku.edu)
  • New images show topographic changes including sediment deposition on active RSL slopes. (uahirise.org)
  • Sometime after the deposition of the sediments, a hot lava formed at considerable depth below the surface in the Wichita area. (fws.gov)
  • The section that follows focuses on river sediments and sites within active floodplains where alluvial deposition is occurring regularly or has occurred over the duration in question for lead deposition. (nap.edu)
  • There was also extensive sediment deposition in the Rocky Mt. region. (thefreedictionary.com)
  • Paleozoic rocks were deposited in warm shallow seas while Mesozoic deposition transitioned back and forth from marine to non-marine sediments with the Cretaceous Seaway periodically covering the area late in that era. (wikipedia.org)
  • Deposition resumed in the Cambrian period and continued through the Paleozoic era, creating nine major formations which together are 4,000 feet (1,200 m) thick (the only geologic period in the Paleozoic not represented is the Silurian ). (wikipedia.org)
  • The results are consistent with the geological record, which includes the processes that uplift the land and cause the erosion and deposition of sediments. (geosociety.org)
  • X Oo S3 Oz Ed U Quaternary Recent Deposition of sediments in Coastal Plain. (ncdcr.gov)
  • Cretaceous"H 'Late Deposition of estuarine and marine sediments in the Coastal Plain. (ncdcr.gov)
  • The deposition of these sediments was interspersed with periods of folding and thrust faulting as well as contemporaneous intrusive and extrusive activity. (yuccamountain.org)
  • Nikolas Michael and colleagues constrain the rates of erosion, transport and deposition of a system where the source regions of sediment can be confidently connected to depositional sinks. (eurekalert.org)
  • Resonance can dominate site response, particularly at sites where there are large property contrasts between the shallowest sediment layers and the deeper bedrock layers, such as in river valleys and sediment-filled basins. (uky.edu)
  • These ranges shed sediment into the basins between them, marked in light gray. (thoughtco.com)
  • To some extent unusual patterns of specific yield are to be expected in large drainage basins where environmental and geologic conditions may vary considerably within the basin. (uwo.ca)
  • The Sheba Ridge is flanked on both sides by sediment-filled basins that reach depths of 13,000 feet (3,900 metres) at the mouth of the gulf. (britannica.com)
  • The Sacramento Valley was divided based on groundwater basins: the Redding basin and the two groups of subbasins east and west of the Sacramento River. (usgs.gov)
  • (a) Map of Central Valley showing groundwater basins and subbasins, groups of basins and subbasins into spatial provinces and domains for textural analysis, and (b) distribution of wells used for mapping texture. (usgs.gov)
  • During this time of massive geologic upheaval, much of central Arizona was faulted into deep basins and high ranges. (mindat.org)
  • The deep basins captured eroded materials from the neighboring mountains and the southern limit of the Verde Valley was blocked by a massive volcanic flow and continued volcanic eruptions added more material to this natural dam.This basin captured materials and water and held it like a huge lake. (mindat.org)
  • Terrestrial, marine, and volcanic rocks deposited in intermontane valleys compose the aquifers herein called the Coastal Basins aquifers ( fig. 102 ). (usgs.gov)
  • The rocks that underlie the basins and form the surrounding mountains are primarily marine sediments and metamorphic and igneous rocks, all of which are of Mesozoic age but locally include rocks of Cenozoic age. (usgs.gov)
  • These marine sediments and continental deposits are tens of thousands of feet thick in some basins. (usgs.gov)
  • Precipitation that falls on the valley floor provides some direct recharge, but in the coastal basins, most of the precipitation evaporates or is transpired by plants. (usgs.gov)
  • Although all the coastal basins have similar hydrogeologic settings, each is different in its geologic history and land- and water-use characteristics. (usgs.gov)
  • Geologic studies have largely been confined to individual basins where detailed stratigraphic and sedimentologic investigations have led to the identification of paleoenvironments and paleogeographic reconstructions important to the better understanding of graben processes and sedimentation. (searchanddiscovery.com)
  • also referred to as zero-order basins, swales, or bedrock depressions) means landforms that are commonly spoon-shaped areas of convergent topography within unchanneled valleys on hillslopes. (wa.gov)
  • The Atlantic Ocean formed, as well as many rift valleys and Triassic basins, including the Dan River basin. (ncdcr.gov)
  • Topography within Eureka County is comprised of north-south-trending mountain ranges typically 5-15 miles wide and intervening broad, alluvium-filled valleys or basins from 10 to 20 miles wide. (yuccamountain.org)
  • He stated: "Cornerstone has considerable expertise in exploring the mineral potential of sedimentary basins through its experience in the search for sediment hosted copper deposits whose geological environments are often also prospective for uranium. (marketwired.com)
  • Scotts Bluff, like the adjoining Wildcat Hills and nearby Chimney Rock, Courthouse and Jail Rock, has been and continues to be weathered out of geologic deposits of alluvial origin that made up the ancient high plains of the region prior to regional uplifting. (nps.gov)
  • The Wetmore area has a significant record of surficial (unconsolidated) deposits of Quaternary age (approximately the last 2 million years of geologic time). (uni.edu)
  • The Las Vegas Formation (LVF) is a well-characterized sequence of groundwater discharge (GWD) deposits exposed in and around the Las Vegas Valley in southern Nevada. (usgs.gov)
  • Nearly monolithologic bedrock surrounds the valley, which provides an excellent opportunity to test the hypothesis that GWD deposits include an aeolian component. (usgs.gov)
  • Deposits in valleys consisting of gravel, sand, and silt. (usgs.gov)
  • While Glacier Peak has shown no sign of eruption in the last few decades, the lahars deposits in the river valleys from past eruptions are a reminder of the hazard Glacier Peak poses to the communities living in the valleys adjacent to the volcano. (wa.gov)
  • Genesis of massive sulfide deposits on a sediment-covered spreading center, Escanaba Trough, 41°N, Gorda Ridge. (tamu.edu)
  • In the most recent advance, glaciers filled the Champlain Valley with ice a mile thick, leaving deposits of glacial till we can still find in our soils, today. (uvm.edu)
  • A delta, characterized by large, flat, fan-shaped deposits of sediment at the mouth of a river, occurs when sediments accumulate more rapidly than ocean currents can carry them away. (noaa.gov)
  • The claims were staked under an agreement (which has now been terminated) with Phelps Dodge Corporation of Canada to explore the area for sediment hosted, stratiform copper deposits. (marketwired.com)
  • As this occurred the area between the two land masses filled with sediments and volcanic deposits (from the magma at the rift zone). (geocaching.com)
  • Then they were covered with mud and sand transported by those streams.Thinking in geologic timeThe vast methane gas deposits now being tapped were cooked up from a stew of decaying organic materials that was compressed and heated for millions of years thousands of feet below the earth's surface. (vaildaily.com)
  • Some of the challenges in conducting N mass balance studies are determining the unmeasured amounts of N removed from the water and stored in aquatic organisms and sediments, and N added to the water from resuspension, erosion, and dissolution processes. (illinois.edu)
  • Geologic time is conceived to be continuous, and a land surface produced or modified by erosion cannot originate instantaneously. (ku.edu)
  • Erosion creates many geologic structures such as canyons, mesas, and hanging valleys. (bioedonline.org)
  • Layer 1 is younger than layer E (and F, G, H, and I), because it sits on top of E. Based on how layers 1-4 fill in the valley, we can also conclude that the erosion creating the valley likely happened after layer C was deposited. (plos.org)
  • The distribution and thickness of the most extensive and continuous buried sand units have been modified considerably by subglacial erosion, and their distributions have been influenced by the buried bedrock valleys. (usgs.gov)
  • Studies of contemporary patterns of erosion in the glaciated and largely undisturbed Canadian landscape reveal spatial patterns that do not conform to the conventional concepts of drainage basin sediment delivery. (uwo.ca)
  • In particular stream and valley side sediment sources dominate over erosion of the land surface, and specific (unit) sediment yield is often positively, rather than inversely, related to drainage area. (uwo.ca)
  • Only in the agricultural areas of the Great Lakes basin and St. Lawrence valley do more conventional patterns of erosion occur. (uwo.ca)
  • Applied studies related to agricultural soil erosion and pollution have helped to illuminate the pathways and sources of sediment in particular cases and show the effects of landscape disturbance. (uwo.ca)
  • In relatively recent geologic time, erosion exposed sections of the fossil-rich Morrison Formation. (rockngem.com)
  • This uplift was accompanied by erosion and the overlying sediments were removed, with the exception of the small remnants of Meers quartzite. (fws.gov)
  • The river sands are topped with a thick layer of coarser sediment that signals the onset of glacial erosion in the valley, the researchers found. (scientificamerican.com)
  • A canyon is a narrow deep valley formed by water erosion or tectonic activity. (reference.com)
  • The sculpting of the Earth's surface by the processes of erosion generates particulate sediment that is transported into regions of subsidence, where it accumulates over long periods of time. (eurekalert.org)
  • This massive erosion created places like the grand canyon, Yosemite valley and great layers of sediment. (chick.com)
  • The effect of differential erosion: rivers draining across hard and soft rocks eventually erode the soft layers into valleys. (usgs.gov)
  • The sediments of the California Miocene came chiefly from the Sierra Nevada and the Klamaths, which, through erosion, were peneplained by the close of the epoch. (encyclopedia.com)
  • Existing geological information has been integrated with newly acquired bathymetry, high-resolution seismic and sonar profiles, vibracores, boxcores, and geochemical data to develop a geologic history and record of sediment distribution of the basin ( Fig. 1 , Fig. 2 ). (usgs.gov)
  • As the basin flooded, the first sediment unit began to accumulate in topographic lows in the west-central part of the lake near the Mississippi River ( Fig. 4 ). (usgs.gov)
  • The elliptical depression to the left is the Searles Lake basin, the smaller linear valley is Panamint Valley and the larger one is Death Valley. (wikipedia.org)
  • [3] Many thousands of feet of sediment filled the slowly subsiding basin. (wikipedia.org)
  • Agreement between extents of alanine racemization for sediments from equivalent depths in two cores from the lake suggests that diagenetic temperatures are uniform within the sediments of the northern basin of Clear Lake. (geoscienceworld.org)
  • the western part of the basin is dominated by Pre-Cambrian and Paleozoic sediments, the southern basin is Mesozoic in age, and the central and eastern part of the basin is dominated by Neogene sediments. (lsu.edu)
  • Tilted rock layers in the Rainbow Basin Natural Area near Barstow, CA. The rocks were originally deposited as a stack of horizontal layers but were later tilted through geologic processes. (plos.org)
  • As a result, he and his colleagues investigated the geological history of the Danakil Rift Valley of Eritrea, including the origin and evolution of Cenozoic rifting, sedimentary basin formation and local rift volcanism, and the effects of climate change as recorded in the region s sediments, fossils and artifacts. (geotimes.org)
  • The lake basin was formed near the Town of Snowmass Village, Colorado when a glacier flowing down Snowmass Creek Valley became thick enough to overtop a low point in the eastern valley wall and entered the head of Brush Creek Valley. (usgs.gov)
  • Over time, the basin slowly filled with (mostly) eolian sediment such that by ~85 ka it contained more of a marsh or wetland than a true lake. (usgs.gov)
  • Scanning Electron Microscope Study of Reservoir Sediments in Southern San Joaquin Basin Oil Fields, California. (csub.edu)
  • Runoff from precipitation in the surrounding mountains infiltrates the permeable sediments of the valley floor either at the basin margins or through streambeds where the water table is lower than the water level in the stream. (usgs.gov)
  • Sediments derived from the ancient Sierra Nevada and Klamaths were transported by rivers to the ocean where they settled in the basin just beyond the edge of the continent. (ucdavis.edu)
  • Those efforts have resulted in the acquisition of three lithium brine exploration projects -- Columbus Basin, Sal Rica, and now Railroad Valley -- totaling over 36,730 acres of mineral claims and representing one of the largest lithium brine exploration holdings in North America. (einpresswire.com)
  • The area was then further investigated in 2016 and 2017 by URI staff, with over 45 sediment and 12 surface brine and spring samples collected within the basin. (einpresswire.com)
  • Based on the results of the reconnaissance scale sampling, coupled with geologic and hydrogeologic analysis of the basin, URI staff identified the most prospective area for acquisition through claim staking. (einpresswire.com)
  • In the Railroad Valley Project area, there appears to be a convergence of several factors favorable for lithium brine formation, including a deep, hydrologically closed basin covered by an evaporative playa, and adjacent Tertiary age felsic volcanic rocks of the Pancake Range that may be a source of lithium in the system. (einpresswire.com)
  • Previous oil exploration in the basin, adjacent to URI's newly acquired land position, has penetrated significant thicknesses of evaporitic and ash-fall sediments, and has demonstrated the existence of a large geothermal anomaly underlying the entire basin. (einpresswire.com)
  • Initial studies planned for the project include additional surface sediment sampling, and acquisition of relevant geophysical data generated from both historical and current oil exploration within the basin for reinterpretation. (einpresswire.com)
  • During Precambrian time and the early Paleozoic Era, marine sediments and volcanics were deposited in an accretionary offshore basin setting within the Cordilleran (ancestral Rocky Mountain) geocline. (yuccamountain.org)
  • Cornerstone's 1,090 claims (272.5 sq km) in the Codroy Valley area are underlain by Carboniferous age sedimentary rocks of the Bay St. George Basin. (marketwired.com)
  • These sediments were eroded off of the rising Taconic mountain belt to the east and deposited westward into a foreland basin to become the base structure of the Austin Glen formation. (geocaching.com)
  • The Stillaguamish setting, the geologic units, are particularly sensitive relative to say a real solid granite bedrock somewhere else. (pbs.org)
  • Alternatively, the springs could flow from sediments containing groundwater that is forced to the surface by the bedrock barrier of Spring Mountain. (utah.gov)
  • A clastic dike approximately 1 cm thick containing sandy sediments cuts the bedrock. (csc.edu)
  • Geologic investigation of the 5.5-km2 (1380-acre) site revealed a sequence of chiefly Illinoian glacigenic sediments from 6 to 60 m (20-200 ft) thick overlying two major bedrock valleys carved in Pennsylvanian strata. (usgs.gov)
  • One major exception is the steep, low-albedo slopes of Melas and Coprates Chasmata, in Valles Marineris where RSL are detected among diverse geologic surfaces (e.g., bedrock, talus) and landforms (e.g., inselbergs, landslides). (uahirise.org)
  • In Midwestern United States, deep valleys formed in the glacial sediment or bedrock are concealed by thick sedimentary sequences formed during multiple Quaternary glaciations. (confex.com)
  • One of the most productive of these aquifers, the Mahomet aquifer, is situated in east-central Illinois over the Mahomet Bedrock Valley, and extends across fourteen counties. (confex.com)
  • If you sample the soils and examine the geology of Burlington's south end, you'll find evidence of these geologic eras in the bedrock and in the surficial sediments. (uvm.edu)
  • The drift-thickness map of Ohio depicts the thickness and distribution of glacially derived sediments (called drift) and post-glacial stream sediments overlying the buried bedrock surface. (gisandscience.com)
  • These maps were created for all 788 7½-minute topographic quadrangles in the state as part of a process to produce accurate bedrock-geology maps for glaciated portions of Ohio and for those areas beyond the glacial boundary where valleys are infilled with sediment. (gisandscience.com)
  • Data concentration and contour intervals on the original, hand-drawn bedrock-topography maps vary widely across the state in response to changing geologic and topographic conditions. (gisandscience.com)
  • Shear wave seismic test locations and boreholes have outlined a buried bedrock valley in the Ottawa, Ontario, suburb of Orleans. (earthdoc.org)
  • Since the in-filled sediments exhibit an extremely low average shear wave velocity (~200 m/s) and the bedrock beneath exhibits shear wave velocities on the order of 2500 m/s, it is suspected that the buried valley may give rise to three-dimensional ground motion amplification phenomena in the event of significant earthquakes. (earthdoc.org)
  • In order to better define the buried valley and to prepare for future three-dimensional shake modeling, shear-wave reflection landstreamer lines were acquired, to confirm the depth to bedrock, and to detail its shape. (earthdoc.org)
  • Geologic controls, such as bedrock geometry and sediment variability, are important in the meadows because of their control on the overall system. (earthdoc.org)
  • The current hypothesis is that the sediments associated with side-valley alluvial fans and fault-related bedrock steps interact to constrict ground water flow. (earthdoc.org)
  • In eastern Kansas, remnants of three or more alluvial terraces that lie from a few feet to about 200 feet above the valley floors are common (Jewett and Merriam, 1959). (ku.edu)
  • Pediments are usually mantled with a covering of alluvial sediment derived from the adjacent mountains. (uni.edu)
  • These facies (in conjunction with borehole information) confirm and extend areas of alluvial fan related sediment distribution. (earthdoc.org)
  • The Titus Canyon Formation is an Eocene geologic formation in California. (wikipedia.org)
  • [2] When the granite was being intruded, the west coast of North America ran through Eastern California and through an embayment that spread toward the Las Vegas Valley . (wikipedia.org)
  • The Central Valley is a flat valley that dominates the interior of California . (wikipedia.org)
  • The Central Valley watershed comprises 60,000 square miles (160,000 km 2 ), or over a third of California. (wikipedia.org)
  • The Central Valley is outlined by the Cascade , Sierra Nevada , and Tehachapi mountain ranges on the east, and the California Coast Ranges and San Francisco Bay on the west. (wikipedia.org)
  • About 7.2 million people live in the Central Valley today, and it is the fastest growing region in California. (wikipedia.org)
  • The movie is supposedly set in the Nevada desert, but a little research shows that it was actually filmed in Lone Pine and Olancha, California, in Owens Valley just west of Death Valley National Park. (agu.org)
  • The California State Geologic Map indicates that the area is mainly Mesozoic metavolcanic and plutonic rocks, with Quaternary sediments making up the valley fill. (agu.org)
  • More than 150,000 optically scanned drillers' logs were obtained from the California Department of Water Resources , and a subset of good-quality logs that were spatially distributed throughout the valley were ultimately selected for use in the texture model. (usgs.gov)
  • Folding, faulting of marine sediments, and associated volcanism resulted in the formation of the Klamath and the Salmon Mountains in northern California and the Coast Ranges that extend along most of the California coast. (usgs.gov)
  • In this chapter we begin by describing the geologic history of the California Coast Ranges, including how they were deformed and uplifted to their present location. (ucdavis.edu)
  • The geologic history of northern California begins with the series of plate convergence and subduction events that added the state to the western edge of North America. (ucdavis.edu)
  • Geologic, Hydrothermal, and Biologic Studies at Escanaba Trough, Gorda Ridge, Offshore Northern California: U.S.G.S. Bull. (tamu.edu)
  • I have led field trips all over the western United States, and a few excursions overseas, but my homebase is the Sierra Nevada, the Great Valley, and the Coast Ranges of California. (blogspot.com)
  • The Eocene in North America was marked by the submergence of the Great Valley of California and a portion of the Atlantic and Gulf coastal plain extending from New Jersey to Texas and into the present Mississippi River valley as far north as S Illinois. (thefreedictionary.com)
  • Franciscan Assemblage or Franciscan Complex is a geologic term for a late Mesozoic terrane of heterogeneous rocks found throughout the California Coast Ranges , and particularly on the San Francisco Peninsula . (wikipedia.org)
  • On the Pacific coast, the Great Valley of California was submerged at the beginning of the Miocene. (encyclopedia.com)
  • The geology of Scotts Bluff is significant from a natural resource standpoint because it affords a view of 740 feet of continuous geologic strata that spans a time period extending from 33 to 22 million years before present. (nps.gov)
  • The exposed geology of the Death Valley area presents a diverse and complex set of at least 23 formations of sedimentary units, two major gaps in the geologic record called unconformities , and at least one distinct set of related formations geologists call a group . (wikipedia.org)
  • The geologic history of the east flank of the Wet Mountains, described previously in "Traverse Along South Hardscrabble Creek: A Trip Through Time," provides an appropriate introduction to "Geology of the Wetmore Area", so I'll not repeat all of those details here. (uni.edu)
  • Some of the more general geology and soil terms are defined in the glossary of the table that supplements the map of ecoregions and subregions of the U.S. For other definitions the user is directed to references such as Bates and Jackson (1980) for geologic terms and Soil Survey Staff (1992) for soil terminology. (fed.us)
  • John Valley, a UW-Madison professor of geology and geophysics who has conducted isotopic analyses of meteorites believed to be from Mars, expects the latest mission to add considerably to our knowledge of Mars and whether or not the planet once had an abundance of water that could have harbored some forms of life. (wtnnews.com)
  • The landform of the soil or yard should be noted in terms of its current geology and likely geologic past. (nap.edu)
  • Estuaries are typically classified by their existing geology or their geologic origins (in other words, how they were formed). (noaa.gov)
  • The Rocky Mountains didn't exist," said Rex Cole, a professor of geology at Mesa State College in Grand Junction.What is now the Roaring Fork Valley was on the western edge of that great sea. (vaildaily.com)
  • You just have to apply geologic time to it," said Andrew Taylor, a professor of geology at Metro State College in Denver. (vaildaily.com)
  • But before Antarctica's deep freeze 34 million years ago, the valley was relatively flat and filled by a lazy river, leaving a riddle for geologists to decode: How did Lambert Graben get so steep, and when was it carved? (scientificamerican.com)
  • By carefully observing the rocks at Hanging Rock State Park, geologists have pieced together their geologic his-tory. (ncdcr.gov)
  • The rock record provides an abundance of fossils, and by the early 1800s, geologists were using physical relationships among rocks as evidence to establish the basis for the geologic time scale. (geosociety.org)
  • Geologists can now identify rocks that record hundreds of millions of years of sedimentation by the slow layer-by-layer accumulation of mud, the rhythmic rise and fall of tides on ancient continental margins, the growth of reefs, and the slow back-and-forth meandering of rivers in ancient valleys. (geosociety.org)
  • Understanding the budget of sediment from source regions to depositional sinks helps geologists to make predictions of the architecture of sedimentary rocks and of the variation in size of the sediment grains -- key factors in the exploitation of oil, gas, water and mineral resources from beneath Earth's surface. (eurekalert.org)
  • That type of sandstone was also found at one time in the Roaring Fork Valley as well as around Rifle.While those sediments were deposited, the earth was also going through the beginning of what geologists called the Laramide Orogeny, a slow process of mountain building. (vaildaily.com)
  • With the interpreted data it was possible to map different geologic units to a depth of up to 4.5m. (environmental-expert.com)
  • These different geologic elements give rise to a great variety of landscapes and plant communities, in what outsiders might consider a flat and uninteresting region. (thoughtco.com)
  • Near Point Reyes, the SAF separates two different geologic terranes. (berkeley.edu)
  • Igneous and sedimentary rocks may be thrust deeply into the Earth by tectonic movements or just accumulate as sediments over millions of years. (bioedonline.org)
  • The liquid was forced up into the overlying sediments and spread out between the sedimentary beds. (fws.gov)
  • Quail Ridge Reserve is located in California's Inner Coast Range in the sedimentary strata of the Great Valley Sequence. (ucdavis.edu)
  • These sediments were buried and transformed into sedimentary rock that was later uplifted and exposed as the Great Valley Sequence (GVS) that forms much of California's eastern (inner) Coast Range, including all of the Quail Ridge Reserve. (ucdavis.edu)
  • Using a new high-resolution age model, a team of scientists identified and dated the disturbed sedimentary layers in a 40-meter marine sediment core raised from Effingham Inlet caused by large and megathrust earthquakes that have occurred over the past 11,000 years. (science20.com)
  • The present land surface in Kansas is an important key to understanding the geologic history of the area (Jewett and Merriam, 1959). (ku.edu)
  • Many of the county's 13,000 to 15,000 private wells and some of the 50 municipal wells tap into this thick layer of water-rich sediment, usually at depths from 50 feet to 150 feet. (gazettextra.com)
  • Rivers carried clay, sand and gravel into this sea and thick layers of sediments were formed. (fws.gov)
  • The sediments also hold clues to the tectonic evolution of East Antarctica, and a mountain range buried beneath the vast, thick ice sheet. (scientificamerican.com)
  • About 34 million years ago, which coincides with a cooling of Earth's climate, big glaciers appeared, shaping the spectacular valley now hidden under thick ice. (scientificamerican.com)
  • Glaciers can carve deep valleys quickly - and did so on Antarctica before it got so cold that the most of it got covered by 1 or 2 miles [1.6 to 3.2 km] of thick, stationary ice,' Peter Reiners, a UA geologist and study co-author, said in a statement. (scientificamerican.com)
  • Fluids in this area are warm (~60°C) and highly altered (suboxic/anoxic), being isolated from the overlying ocean by a thick accumulation of sediment. (darkenergybiosphere.org)
  • West of the uplift, a thick sequence of Mesozoic marine and continental sediments was deposited, interspersed with lava flows, volcanic breccia, and tuff (Price, 2004). (yuccamountain.org)
  • An accretion wedge of clastic sediment then started to accumulate at the base of the submerged precipice, entombing the region's first known fossils of complex life. (wikipedia.org)
  • If you look at the geologic record there are fingerprints of catastrophe everywhere one looks", he says. (chick.com)
  • A look at the geologic map will show that many rock bodies in the Metamorphic Core and Methow Domains in particular are aligned northwest-southeast. (usgs.gov)
  • Mineralogy and geochemistry of active and inactive chimneys and massive sulfide, Middle Valley, Northern Juan de Fuca Ridge: an evolving hydrothermal system. (tamu.edu)
  • Geochemistry of hydrothermal vent fluids from Middle Valley, Juan de Fuca Ridge. (tamu.edu)
  • Geochemistry of hydrothermally altered sediment, Middle Valley, northern Juan de Fuca Ridge. (tamu.edu)
  • In the initial phase of C-DEBI, exploration of microbial life, geochemistry and hydrogeology in the sediment and igneous crust was focused at four primary field sites - Juan de Fuca Ridge flank, South Pacific Gyre, North Pond, and Dorado Outcrop. (darkenergybiosphere.org)
  • Cornerstone completed a lake sediment geochemistry survey of the area over the winter. (marketwired.com)
  • ALLUVIUM ---A general term for clay, silt, sand, gravel, or similar unconsolidated detrital material deposited during comparatively recent geologic time by a stream or other body of running water as a sorted or semisorted sediment in the bed of the stream. (fed.us)
  • As these glaciers move toward the ocean they carve long, deep valleys in the coastlines. (thoughtco.com)
  • They started grinding and forming deep valleys. (scientificamerican.com)
  • Site response occurs when seismic waves are modified by shallow geologic layers and can result in additional damage from strong earthquakes. (uky.edu)
  • So while this classic movie spawned three sequals and a 2003 TV series, you shouldn't be worried about tremors of the graboid variety while visiting the Owens Valley - but watch out for earthquakes! (agu.org)
  • Please join us at our new site http://blog.azgs.arizona.edu/ for frequent and telling updates on the state of Arizona's mineral resources, new geologic maps and reports, and for geologic hazard assessment and analysis: landslides, floods, earthquakes, debris flows, earth fissure, radon, and more. (blogspot.com)
  • The only way to predict the frequency and intensity of the ground motion expected from large and giant "megathrust " earthquakes is to analyze the geologic record and a new paper in the Canadian Journal of Earth Sciences gives a well-dated first record of earthquake history along the south coast of British Columbia. (science20.com)
  • In Effingham Inlet, on the west coast of Vancouver Island, these sediments reveal disturbances we interpret were caused by earthquakes. (science20.com)
  • It gives us our first glimpse back in geologic time, of the recurrence interval of large and megathrust earthquakes impacting the vulnerable BC outer coastline. (science20.com)
  • However, most gorges are formed from geologic uplifts caused by earthquakes and orogeny. (reference.com)
  • The detectives uncovering evidence of this earthquake are paleoseismologists, practicing their new field of identifying earthquakes by their geologic signature. (oregonstate.education)
  • We just delivered geologic map data for four 7.5' quadrangles to the US Geological Survey as part of our 2017 STATEMAP work - see the list below. (blogspot.com)
  • CENTENNIAL, Colo., June 20, 2017 (GLOBE NEWSWIRE) -- Uranium Resources, Inc. (Nasdaq:URRE) (ASX:URI) , an energy metals exploration and development company, announced that it has acquired a third lithium exploration project, through the staking of 9,270 acres of federal placer mining claims within the Railroad Valley of central Nevada. (einpresswire.com)
  • Sediments from the surrounding mountains filled the valley over geologic time periods. (wikipedia.org)
  • The sand dunes had formed as part of sediments from the surrounding mountains. (everything-everywhere.com)
  • The mountain range between Death and Panamint valleys is the Panamint Range and the Black Mountains bound the other side of Death Valley. (wikipedia.org)
  • Outcrops can be seen along the front of the Black Mountains in Death Valley and in the Talc and Ibex Hills. (wikipedia.org)
  • Going north inland from Los Angeles to Bakersfield, Interstate 5 reaches a final crest at Tejon Pass, a gap in the Tehachapi Mountains, and plunges into the Great Central Valley. (csmonitor.com)
  • As the highway begins its descent, the mountains break to either side and run north as far as the eye can see, embracing the flat expanse of valley that stretches out ahead. (csmonitor.com)
  • Its origins give the valley the distinction of being filled with sediment that came not from its surrounding mountains via its two major rivers, the San Joaquin and Sacramento, but from the depths of the sea. (csmonitor.com)
  • The rugged yet protected landscape of the Wichita Mountains Wildlife Refuge is the result of over half a billion years of geologic history. (fws.gov)
  • There were several episodes of mountain building, metamorphosing and uplifting the rock, forming the Cariboo Range, the mountains that now rim the lakes.The present day appearance of the Bowron Lake circuit is due to far more recent geologic activity, the repeated glaciations over the past two million years. (redwoodtimes.com)
  • Based on the orientation of the glacial valleys and features, the cap was centered over the Cariboo Mountains and the ice moved slowly out in all directions. (redwoodtimes.com)
  • Eventually, these mountains will disappear sometime in the distant fu-ture of geologic time. (ncdcr.gov)
  • Usually, however, the cycle is interrupted many times by geologic events, especially in mountains like the North Cascades. (usgs.gov)
  • From the shores of Long Island to the Adirondack Mountains to Lake Ontario, the rocks of New York State tell a tale of a fascinating geologic history. (geocaching.com)
  • It's public, but whether it gets disseminated to the people who make land-use decisions and planning for geologic hazards doesn't necessarily happen," said Dan McShane, a geologist in Whatcom County, Wash. (pbs.org)
  • The Geological Survey of Alabama has much more information on the state's rocks, mineral resources, and geologic hazards. (thoughtco.com)
  • They also checked the South Tahoma Glacier for additional outburst geologic hazards. (visitrainier.com)
  • The structure contour map ( Fig. 4 ) of the Pleistocene surface shows the contact is shallow (near the sediment surface, 2 m below sea level) in northeast Lake Pontchartrain and deeper (20 m below sea level) to the southwest. (usgs.gov)
  • The geologic setting of the Ziegler Reservoir fossil site is somewhat unusual - the sediments containing the Pleistocene fossils were deposited in a lake on top of a ridge. (usgs.gov)
  • The key to Lambert Graben's history was found in layers of sediments just offshore, in Prydz Bay. (scientificamerican.com)
  • Sediments of the Rhone river are characterized by strong heterogeneity between clay, sand and gravel units. (environmental-expert.com)
  • It filled with soft lake sediments - sand, clay, gravel, material that falls apart when it's wet. (pbs.org)
  • This aquifer is overlain by an extensive aquitard, which in turn is overlain by a more complex unit which contains discontinuous sand-gravel layers forming small aquifer zones, interstratified with layers of finer-grained sediment. (confex.com)
  • At the end of the last glacial period, melting ice deposited huge amounts of porous sand and gravel along the ancient river valley. (gazettextra.com)
  • These sediments have formed over a period of numerous geologic time periods. (everything-everywhere.com)
  • Rapid variations of water-surface level in river channels through time, in combination with the occurrence from time to time of overbank flow in flat-bottomed valleys, have promoted intensive study of the discharge relationships and the probability characteristics of peak flow. (britannica.com)
  • It follows that placement of the surface in geologic time is only approximate, that is, partly pre-Tertiary, or late Cretaceous, and partly post-Cretaceous, or early Tertiary. (ku.edu)
  • The fact that these soft sediments are still present in the landscape, however, suggests that this feature's age is much closer to the minimum age, possibly during historic time. (csc.edu)
  • Many phenomena that have not yet been adequately explained occurred in the latest period of geologic time. (grisda.org)
  • Today, I offer some background information on the geologic time scale and why it is so hard to figure out how old rocks are. (plos.org)
  • Earth's history is divided into different chunks of geologic time, going all the way back to the formation of our planet. (plos.org)
  • Unlike calendars or clocks, which divide time into units of equal length (e.g., days or seconds), the divisions of geologic time aren't the same length. (plos.org)
  • geologic time is based on the succession of rock layers. (plos.org)
  • Geologic time was the first method scientists used to understand the sequence of events in Earth's history. (plos.org)
  • More recently, we've used other methods to associate actual dates with different rock layers, thus linking geologic time (a relative method) with absolute time (= numbers of years old). (plos.org)
  • This merger of geologic time and absolute time is the geologic time scale. (plos.org)
  • Don't have a geologic time scale handy? (plos.org)
  • Geologic time is hard to sort out. (plos.org)
  • The first known geologic event in this region took place 550 to 600 million years ago (Early of Middle Cambrian time). (fws.gov)
  • The next major geologic event took place in the Middle Cambrian time (500 to 550 million years ago). (fws.gov)
  • For much of geologic time, the area where Bowron Lakes is now located was under the ocean along the western continental margin of the craton slowly accumulating sediments eroded from the land. (redwoodtimes.com)
  • Like Alaska's mighty Yukon, a broad river once flowed across Antarctica, following a gentle valley shaped by tectonic forces at a time before the continent became encased in ice. (scientificamerican.com)
  • The application of zircon chronology in constraining sediment provenance.and the calibration ofthe geologic time-scale are reviewed by Fedo et al. (minsocam.org)
  • in the Cenozoic era Cenozoic era , last major division of geologic time (see Geologic Timescale, table) lasting from 65 million years ago to the present. (thefreedictionary.com)
  • of geologic time, from approximately 54.9 to 38 million years ago. (thefreedictionary.com)
  • In geologic time, which is often measured on scales of hundreds of thousands to millions of years, estuaries are often fleeting features of the landscape. (noaa.gov)
  • Miocene epoch (mī´əsēn) , fourth epoch of the Tertiary period in the Cenozoic era of geologic time (see Geologic Timescale , table), lasting from around 24.6 to 5.1 million years ago. (encyclopedia.com)
  • Countless streams transported sediments across that broad coastal plain," said David Uhl, a senior geologist with EnCana Oil and Gas USA, one of the major energy companies drilling in the Mamm Creek Field.Colorado had a subtropical climate at the time, so it was much warmer, humid and rainy. (vaildaily.com)
  • In western Colorado, the Colorado River cut deeply into the sediments to carve out the sprawling Grand Valley, the present site of Grand Junction and Fruita. (rockngem.com)
  • Rockslides into valleys may dam streams uplift of the land gives streams new energy glaciers grow and carve valleys into different profiles, or divert streams to a new locales and volcanoes grow and change the landscape altogether. (usgs.gov)
  • His geologic and anthropologic studies in other fossil and artifact-rich East African rift valleys convinced him that geologic units within Eritrea would also yield an archaeological bounty. (geotimes.org)
  • Davis, E.E., and Fisher, A.T., 1994, On the nature and consequences of hydrothermal circulation in the Middle Valley sedimented rift: Inferences from geophysical observations, ODP Leg 139. (tamu.edu)
  • Tectonic and thermal structure of the Middle Valley sedimented rift, Northern Juan de Fuca Ridge. (tamu.edu)
  • During the past two decades, the rift valley system of eastern Africa has been the focus of many interdisciplinary scientific studies because of the peculiar tectonic setting that it represents and the abundant evidence of early man enclosed by graben-fill sediments. (searchanddiscovery.com)
  • It is also a residual mineral found in soils and sediments. (geology.com)
  • We then discuss the origins of the sediments found at Quail Ridge and the derivation of local soils. (ucdavis.edu)
  • During the last several decades, a wide array of analytic techniques have been used, with varied degrees of success, to determine the relative contributions of lead from natural and anthropogenic sources in soils, sediments, water, and air. (nap.edu)
  • A key question is whether relatively new "small pillar" mining techniques used at the site may be insufficient to resist powerful geologic sources associated with both the continental scale compression that is impacting the glacial valley sediments and the glacial scour weakened lithified strata that is the overburden," the letter reads. (toxicstargeting.com)
  • The researchers have measured the radiocarbon contents of individual solvent-extractable short-chain (C14, C16, and C18) fatty acids isolated from Ross Sea surface sediments. (nasa.gov)
  • Tectonic process scraped and deformed some of these sediments onto the edge of the continent. (redwoodtimes.com)
  • This north face of Scotts Bluff has exposed the most geologic history of any location in the state of Nebraska. (nps.gov)
  • The geologic history of the Chesapeake Bay includes physiographic provinces, tectonics, ice ages, and ocean processes. (nps.gov)
  • The San Luis Valley wherein the Great Sand Dunes National Park belongs to have a history of human habitation that goes back to 11,000 years ago. (everything-everywhere.com)
  • Recognition of these interruptions in the record is extremely important in helping to understand the geologic history of the area. (ku.edu)
  • This section will emphasize aspects of the geologic history of the Wetmore area that were not covered elsewhere. (uni.edu)
  • This part of Alabama formed in the shallow waters that have covered most of the central continent throughout geologic history. (thoughtco.com)
  • The reason is the area's geologic history. (gazettextra.com)
  • The rover's mission is to sample the planet's rocks and sediments for clues to Mars' geologic history. (wtnnews.com)
  • Sampling the chemistry of the lowest exposed layers of Mount Sharp, Curiosity will be reading from a page of Mars' geologic history from the very distant past, and as the rover commences its true climb up the mountain's slope through ever more recent layers of the past its primary mission activity is now beginning. (kqed.org)
  • The geologic history of Burlington's South End neighborhood is a small piece of the ancient story that has shaped the landscape of the entire city. (uvm.edu)
  • In addition to what we know about the geologic history of the South End, there are remaining geologic mysteries in the topography as well: Burlington is a city on a hill. (uvm.edu)
  • On the east side of the fault is the Franciscan Complex, made of a mixture of Mesozoic oceanic crustal rocks and sediments, which were accreted onto the North American continent during subduction of the Farallon plate. (berkeley.edu)
  • Mesophilic, methane-fueled ecosystems in shallow-water permeable sediments may comprise distinct microbial habitats due to their unique biogeochemical and physical characteristics. (frontiersin.org)
  • In general, the Sacramento Valley predominantly is fine-grained and reflects the more fine-grained volcanic-derived sediments. (usgs.gov)
  • In the San Joaquin Valley, especially on the eastern side, the areas of coarse-grained texture are more widespread than the areas of fine-grained texture and occur along the major rivers. (usgs.gov)
  • This area of predominately fine-grained texture is associated with the largest amount of subsidence attributed to groundwater withdrawals recorded in the valley. (usgs.gov)
  • In most areas, the buried sand units are confined by low-permeability till, lacustrine sediment, colluvium, and loess. (usgs.gov)
  • Think of the geysers and volcanism at Yellowstone, the Colorado River and two billion years of sediments at Grand Canyon, the glacial valleys and granite outcrops of Yosemite. (blogspot.com)
  • Lateral and vertical variations in sediment texture affect the direction and rate of groundwater-flow as well as the magnitude and distribution of aquifer-system compaction, manifested as land subsidence. (usgs.gov)
  • C-DEBI field sites globally span a range of subseafloor environments, e.g., seafloor below oligotrophic ocean gyres, ridge systems and ridge flanks, and seamounts where fluids flow into or discharge from the subseafloor, with variations in sediment cover, rock type, crustal age, and fluid temperatures, among other environmental conditions that impact the deep biosphere. (darkenergybiosphere.org)
  • The US Geological Survey webpage on Rocks provides explanations of geologic processes. (bioedonline.org)
  • Understanding the sediments mineralogy and the geochemical processes operating in the subsurface are becoming increasingly important as new technologies are applied to enhance oil production, and such information is critical for predicting the effects of CO2 injection. (csub.edu)
  • The discovery of radioactivity in the twentieth century and its use for measuring the ages of rocks has made it possible to quantify Earth's age and to estimate rates of many geologic processes. (geosociety.org)
  • Because rivers flow along the path of least resistance, the depression created by the crater caused river valleys to converge, setting the stage for the formation of the Chesapeake Bay. (nps.gov)
  • Both of these genera are present in the Titus Canyon Formation sediments of Death Valley National Park. (wikipedia.org)
  • The main factor in the gulf's geologic formation is the spreading of the seafloor away from the Sheba Ridge axis. (britannica.com)
  • These landmark discoveries had all occurred within exposures of the Morrison Formation , the sediments of which were laid down during the Jurassic Period some 160 million years ago. (rockngem.com)
  • A forest fire in the Nebraska National Forest south of Chadron during the summer of 2006 removed vegetation and exposed previously covered rock outcrops suitable for geologic study. (csc.edu)
  • The geometric shapes of plateaus, peaks and outcrops of bare brown rock look over endless valleys of olive-yellow grasslands. (scientificamerican.com)
  • Postglacial alluvium underlies stream valleys on and adjacent to the site. (usgs.gov)
  • These are sediment-hosted concentrations of cassiterite in stream valleys and along shorelines. (geology.com)
  • Fjords are the final type of geologic estuary and they are created by glaciers. (thoughtco.com)
  • After the glaciers later retreat, seawater fills in the valleys to meet freshwater coming in from the land to form estuaries. (thoughtco.com)
  • As advancing glaciers move toward the ocean creating their valleys they also deposit sediment that creates a sill at the mouth of the valley near the ocean. (thoughtco.com)
  • Thomson and his colleagues analyzed sediments drilled from the ocean floor just offshore of Lambert Glacier, as well as from onshore moraines, the rock piles pushed up by glaciers. (scientificamerican.com)
  • Fjords are steep-walled river valleys created by advancing glaciers, which later became flooded with seawater as the glaciers retreated. (noaa.gov)
  • For example, reindeer fossils have been found with hippopotamus fossils in the Thames River valley of southern England (Grayson 1984, p. 16). (grisda.org)
  • Unlike the orderly strata of the Great Valley Sequence, the Franciscan complex became so badly deformed that it contains very complex structure and few fossils. (ucdavis.edu)
  • Franciscan sediments contain a sparse, but diverse assemblage of fossils . (wikipedia.org)
  • The cores record sediments associated with at least the last glacial cycle, and possibly earlier ones. (sfu.ca)
  • This data set is comprised of radiocarbon ages derived from organic carbon that is bound in diatom frustules found in sediment cores from the Southern Ocean. (nasa.gov)
  • Sediment cores taken near extant springs along the western margin of Soda Lake playa, as well as from the playa center, reveal dramatic hydrologic changes that occurred in the central Mojave Desert during the late Quaternary. (usgs.gov)
  • It also supports paleoseismic data found in offshore marine sediment cores along the US portion of the Cascadia Subduction Zone, recently released in an important United States Geological Survey (USGS) paleoseismic study by a team of researchers led by Dr. Chris Goldfinger of Oregon State University. (science20.com)
  • One of the co-authors of the study, Dr. Audrey Dallimore, Associate Professor at Royal Roads University explains: "Some BC coastal fjords preserve annually layered organic sediments going back all the way to deglacial times. (science20.com)
  • In addition to being classified as a geologic estuary, fjords are also a type of water circulation estuary. (thoughtco.com)
  • The Central Valley is a large structural trough filled with sediments of Jurassic to Holocene age, as much as 3 miles deep in the San Joaquin Valley, and as much as 6 miles deep in the Sacramento Valley. (usgs.gov)
  • This region is in a significant high seismic hazard zone, and the surficial materials are primarily high water-content, poorly compacted Holocene-age Champlain Sea sediments. (earthdoc.org)
  • Rock strata exposed along the margins of the valleys in the "Pahrump Hills" region on Mars. (kqed.org)
  • After lakes within the valley receded, exposed sand was blown by the predominant southwest winds toward the Sangre de Cristos, eventually forming the dunefield over an estimated tens of thousands of years. (wikipedia.org)
  • As the lakes that are found within the valley had receded, it exposed sand was blown by the southwest winds. (everything-everywhere.com)
  • These valleys partially filled with sediment and, during colder periods during the current ice age , with lakes. (wikipedia.org)
  • The movement interacted with the geologic fabric of the land, gouging deeper valleys in weaker areas, and leaving the stronger rocks as sharply etched peaks, and in the Bowron Lakes area, creating a unique circuit of lakes. (redwoodtimes.com)
  • With up to 40 cm thickness the zones of AOM activity were unusually large and occurred in deeper sediment horizons (20-50 cm below seafloor) as compared to diffusion-dominated deep-sea seeps, which is likely caused by advective flow of pore water due to the shallow water depth and permeability of the sands. (frontiersin.org)
  • Craters containing shallow, degraded, flat-floored interiors tended to have dunes with high sediment fluxes/activity, whereas local kilometer-scale topographic obstructions (e.g., central peaks, yardangs) were found to be inversely correlated with dune mobility. (uahirise.org)
  • To the west, the ridge gives way to a relatively shallow east-west-trending valley known as the Tadjoura Trench. (britannica.com)
  • These valleys are infilled with sediments holding significant supplies of groundwater, aggregate material, and shallow gas. (confex.com)
  • As oceanic crust descended beneath the continent, volcanic rocks, mainly basalt , making up the lower plate, and marine sediments deposited on top of it were scraped off and accreted (i.e., added) to the leading edge of the overriding plate. (wikipedia.org)
  • The valley is bounded by the Coast Ranges to the west and the Sierra Nevada to the east. (wikipedia.org)
  • of Pacific plate to Sierra Nevada Great Valley microplate motion is primarily accomodated by the RCF and the GVF. (berkeley.edu)
  • Understanding what happened when rivers of ice later filled the valley could solve certain climate and geologic puzzles about the southernmost continent. (scientificamerican.com)
  • The oldest rocks in the area that now includes Death Valley National Park are extensively metamorphosed by intense heat and pressure and are at least 1700 million years old. (wikipedia.org)
  • Next, the metamorphosed Precambrian basement rocks were uplifted and a nearly 500-million-year-long gap in the geologic record, a major unconformity , affected the region. (wikipedia.org)
  • Tertiary volcanic rocks (25 to 30 million years old) crop out along the margins of the Wet Mountain Valley graben in several places. (uni.edu)
  • The Coast Range Ophiolite lies between the rocks of the Great Valley Sequence and the Franciscan mélange, and represents the oceanic crust on which the Great Valley sediments were deposited. (ucdavis.edu)
  • But no one knows for sure until you sample the rocks or the sediments. (scientificamerican.com)
  • Some rocks preserve the original bedding ( layering), as well as cross- bedding where the sediment layers are aligned at an angle to one another. (ncdcr.gov)
  • Eventually, hard layers or other hard parts of rocks stand out in bold relief, and softer layers or parts retreat into swales, gullies, and valleys. (usgs.gov)
  • Therefore, a young stream on a newly uplifted mountain block will erode rapidly, cutting a deep valley into the rocks. (usgs.gov)
  • This investigation was undertaken to gain an understanding of the geologic relationships between undifferentiated rocks of possible Atokan age and those of the underlying Kearny (rocks of possible Morrowan-age) and the overlying Cherokee Group. (ku.edu)
  • The rocks of the Hudson valley area demonstrate a tale of inland seas and massive mountain building events. (geocaching.com)
  • The anaerobic oxidation of methane (AOM) is a key biogeochemical process regulating methane emission from marine sediments into the hydrosphere. (frontiersin.org)
  • The anaerobic oxidation of methane (AOM) is a key biogeochemical process regulating methane emission from marine sediments and is mediated by anaerobic methane-oxidizing archaea (ANME) and sulfate-reducing bacteria (SRB) ( Knittel and Boetius, 2009 ). (frontiersin.org)
  • Marine AOM has mainly been investigated in deep-sea methane seeps, which are characterized by steep opposing gradients of methane and sulfate in the top centimeters of the sediment. (frontiersin.org)
  • When the glacier retreated at the end of the marine isotope stage (MIS) 6, ~155-130 ka (thousands of years before present), the Brush Creek Valley lobe left behind a moraine that impounded a small alpine lake. (usgs.gov)
  • As this new lithosphere forms, older lithosphere migrates away from the spreading centers, subsides, and becomes buried under marine sediments. (ucdavis.edu)
  • Russell Shapiro, professor of paleontology, and department chair Todd Greene, a specialist in deep marine sediments, led a team of volunteers from environmental consulting firm SWCA to the site a few miles north of the 118 Freeway in Tapo Canyon. (laist.com)
  • f * * Jurassic Late Marine sediments deposited on outer continental shelf. (ncdcr.gov)
  • The rough topography of the ridge includes a well-defined median valley that is continually offset by faults running approximately northeast to southwest. (britannica.com)
  • The scientific interest of this site has been apparent since the late 1890s when the U.S. Geological Survey made the first formal geologic investigation of the area. (nps.gov)
  • Geologic Maps of the 50 United States Created by Andrew Alden from the U.S. Geological Survey's Geologic Map of the United States , 1974, by Philip King and Helen Beikman ( fair use policy ). (thoughtco.com)
  • For a recent hydrogeological study of buried valleys in east-central Illinois, a multi-scalar approach was employed to analyze and interpret geological and geophysical data. (confex.com)
  • A geological framework model was developed to analyze sediment landform architecture and heterogeneity of this unit at the facies assemblage scale. (confex.com)
  • The subdivision of the San Joaquin Valley is complex because it is divided laterally and vertically. (usgs.gov)
  • However, the hydrogeology of the San Joaquin Valley is dominated by the Corcoran Clay. (usgs.gov)
  • Several geologic carbon sequestration projects are proposed in the San Joaquin Valley. (csub.edu)
  • Air quality in California's San Joaquin Valley has long ranked as one of the worst in the nation but NOx emission controls are improving the situation. (phys.org)
  • Phys.org) -Air quality in California's San Joaquin Valley, which for years has been ranked as one of the worst in the United States has improved over the past decade and looks to improve even more in the future. (phys.org)
  • Our study showed that NOx reductions in the San Joaquin Valley as the result of implemented controls have dramatically decreased the very large fraction of total aerosol that is ammonium nitrate," Pusede said. (phys.org)
  • According to the American Lung Association, the San Joaquin Valley experiences the worst pollution in the U.S. by small particulate matter (PM2.5) - particles of soot, dust, unburned fuel, and matter chemically formed in the atmosphere that are 2.5 micrometers or less in size. (phys.org)
  • While PM2.5 is a wintertime problem, in the summer the San Joaquin Valley is second only to Los Angeles for having the worst ozone pollution levels. (phys.org)
  • As a result, extremely poor air quality in the San Joaquin Valley is a year round problem," Pusede said. (phys.org)
  • Pusede and Cohen, a leading authority on atmospheric chemistry with Berkeley Lab's Environmental Energy Technologies Division, examined 15 years of data on NOx and other emissions, and their chemical products in three key San Joaquin Valley cities - Fresno, Visalia and Bakersfield. (phys.org)
  • Pusede and Cohen used this NOx constraint to interpret trends in wintertime PM2.5 over the last decade in San Joaquin Valley where a large portion of the total aerosol mass is ammonium nitrate . (phys.org)
  • Added Cohen in commenting on the research, "The bottom line is that air quality in the San Joaquin valley is substantially better as a result of NOx reductions and we predict it will get better still as new regulations take effect. (phys.org)
  • Geologic and geomorphic data on forty-two world deltas were compiled for a NASA-sponsored research project. (lsu.edu)
  • Deltas are a type of geologic estuary that form at the mouth of a large river where sediment and silt carried by the river are deposited where the river meets the ocean. (thoughtco.com)
  • This process resulted in the area's unique geologic features, such as Scotts Bluff. (nps.gov)
  • Sea-level rise flooded the 'Pontchartrain Embayment' between 6,000 to 4,000 BP ( Fig. 9 ) and deposited transgressive nearshore or lagoonal/estuarine sediments across the area over the ravinement surface. (usgs.gov)
  • As the large ice sheets on land began to melt around 10,000 to 18,000 years ago sea levels began to rise and fill in low-lying river valleys to create coastal plain estuaries. (thoughtco.com)
  • 138 Early Sediments deposited in northern half of the Coastal Plain. (ncdcr.gov)
  • Coastal plain estuaries, or drowned river valleys, are formed when rising sea levels flood existing river valleys. (noaa.gov)
  • The same process that was spreading sediments on the broad coastal plain was also dumping them for millions of years into the inland sea. (vaildaily.com)
  • In the late 17th century, Diego de Vargas, a Spanish governor of Santa Fe de Nuevo México, became the first European on record to enter the San Luis Valley. (wikipedia.org)
  • A spring pool that was active ~50,000 years ago is preserved in the geologic record in the Las Vegas Valley, Nevada. (usgs.gov)
  • These findings also clearly illustrate the importance of analyzing the geologic record to help today's planners and policy makers, and ultimately to increase the resiliency of Canadian communities. (science20.com)
  • Over two years since landing on the gravely floor of Gale Crater on Mars, NASA's Mars Science Laboratory rover, Curiosity, has reached the base of its primary mission goal, Mount Sharp: a 3-mile-high mound of sediment that preserves a geologic record of Mars going back billions of years. (kqed.org)
  • The geologic record reveals how forms of life have responded to past environmental change, sometimes migrating, sometimes evolving, and sometimes going extinct. (geosociety.org)
  • Here we present the discovery of a 2.84- to 2.58-million-year-old fossil and hominin-bearing sediments in the Ledi-Geraru research area of Afar, Ethiopia, that have produced the earliest record of the genus Homo . (sciencemag.org)
  • Bar built estuaries, also called restricted mouth estuaries, are created when sandbars and barrier islands are formed after ocean currents push sediment toward the shore in areas fed by rivers and streams ( NOAA ). (thoughtco.com)
  • This report presents a historical framework detailing the impact of geologic features on excess gas emissions and resultant mine explosions. (cdc.gov)
  • ē`əsēn') , second epoch of the Tertiary period Tertiary period , name for the major portion of the Cenozoic era, the most recent of the geologic eras (see Geologic Timescale, table) from around 26 to 66 million years ago. (thefreedictionary.com)
  • Between 20 and 80% of the methane (around 10 6 tons of carbon per year) is consumed at the sediment water interface by methanotrophic microbial communities ( Boetius and Wenzhöfer, 2013 ). (frontiersin.org)
  • Rising sea levels at the end of the last ice age, about 10,000 years ago, flooded the Susquehanna River valley. (nps.gov)
  • it filled Death Valley during each glacial period from 240,000 years ago to 10,000 years ago. (wikipedia.org)
  • AOM is largely mediated by consortia of anaerobic methanotrophic archaea (ANME) and sulfate-reducing bacteria (SRB), and has mainly been investigated in deep-sea sediments. (frontiersin.org)
  • Each year, the Susquehanna River transports more than a million tons of sediment to the Bay. (nps.gov)
  • Nearly 4,000 years ago, a landslide sent boulders and sediment tumbling into a valley of the Yellow River. (nationalgeographic.com)
  • The discovery marks the end of a nine-year journey for Wu, who first noticed evidence for the flood in 2007 after examining the Jishi Gorge, an upstream river valley for the Yellow River. (nationalgeographic.com)
  • Towards the end of the last Ice Age, the Stillaguamish River Valley was a giant lake, blocked in by a glacier. (pbs.org)
  • To obtain subsurface geologic information about the alluvium in the Big Thompson River valley, S -wave refraction data were collected along three roads that cross the valley. (nasa.gov)
  • The Sacramento and San Joaquin river systems drain their respective valleys and meet to form the Sacramento-San Joaquin River Delta , a large expanse of interconnected canals , stream beds , sloughs , marshes , and peat islands. (wikipedia.org)
  • During deglaciation large river valley meanders were cut by runoff from the melting ice sheets. (grisda.org)
  • Geologic mapping has documented the extent of previous lahar runout in the Skagit and Stillaguamish River valleys. (wa.gov)
  • Some of these sediments travel down the Dan River on their way to the Atlantic Ocean. (ncdcr.gov)
  • The highest point in the county is Summit Mountain at 10,400 feet in the southern portion of the county, while the lowest point in the county is on the Humboldt River in the northwestern portion of the county .The Humboldt River drains the northern portion of the county and the southern portion drains into Diamond Valley. (yuccamountain.org)