Geologic Sediments
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)
Water Microbiology
RNA, Ribosomal, 16S
Water Pollutants, Chemical
Rivers
DNA, Ribosomal
Bacteria
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.
Methane
Biodegradation, Environmental
Deltaproteobacteria
Sulfur-Reducing Bacteria
Archaea
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.
Estuaries
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)
Oceans and Seas
Sequence Analysis, DNA
Ecosystem
Lakes
Genes, rRNA
Water Pollution, Chemical
Rhizophoraceae
Biodiversity
Soil Microbiology
Anaerobiosis
Molecular Sequence Data
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.
Water Pollutants
Wetlands
Uranium
Environmental Monitoring
Geology
Arctic Regions
Eutrophication
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.
RNA, Bacterial
Water Pollutants, Radioactive
Gammaproteobacteria
Aroclors
Soil Pollutants
Water Movements
Polycyclic Hydrocarbons, Aromatic
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)
Oxidation-Reduction
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).
Biota
Petroleum
Bays
Sulfides
Humic Substances
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).
Marine Biology
Carbon
Metals, Heavy
Crenarchaeota
Foraminifera
Proteobacteria
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.
Fatty Acids
Antarctic Regions
Thiotrichaceae
Bacterial Typing Techniques
Soil
Desulfocella halophila gen. nov., sp. nov., a halophilic, fatty-acid-oxidizing, sulfate-reducing bacterium isolated from sediments of the Great Salt Lake. (1/2414)
A new halophilic sulfate-reducing bacterium, strain GSL-But2T, was isolated from surface sediment of the Southern arm of the Great Salt Lake, UT, USA. The organism grew with a number of straight-chain fatty acids (C4-C16), 2-methylbutyrate, L-alanine and pyruvate as electron donors. Butyrate was oxidized incompletely to acetate. Sulfate, but not sulfite or thiosulfate, served as an electron acceptor. Growth was observed between 2 and 19% (w/v) NaCl with an optimum at 4-5% (w/v) NaCl. The optimal temperature and pH for growth were around 34 degrees C and pH 6.5-7.3, respectively. The generation time under optimal conditions in defined medium was around 28 h, compared to 20 h in complex medium containing yeast extract. The G+C content was 35.0 mol%. 16S rRNA gene sequence analysis revealed that strain GSL-But2T belongs to the family Desulfobacteriaceae within the delta-subclass of the Proteobacteria and suggested that strain GSL-But2T represents a member of a new genus. The name Desulfocella halophila gen. nov., sp. nov. is proposed for this organism. The type strain of D. halophila is strain GSL-But2T (= DSM 11763T = ATCC 700426T). (+info)Isolation from estuarine sediments of a Desulfovibrio strain which can grow on lactate coupled to the reductive dehalogenation of 2,4, 6-tribromophenol. (2/2414)
Strain TBP-1, an anaerobic bacterium capable of reductively dehalogenating 2,4,6-tribromophenol to phenol, was isolated from estuarine sediments of the Arthur Kill in the New York/New Jersey harbor. It is a gram-negative, motile, vibrio-shaped, obligate anaerobe which grows on lactate, pyruvate, hydrogen, and fumarate when provided sulfate as an electron acceptor. The organism accumulates acetate when grown on lactate and sulfate, contains desulfoviridin, and will not grow in the absence of NaCl. It will not utilize acetate, succinate, propionate, or butyrate for growth via sulfate reduction. When supplied with lactate as an electron donor, strain TBP-1 will utilize sulfate, sulfite, sulfur, and thiosulfate for growth but not nitrate, fumarate, or acrylate. This organism debrominates 2-, 4-, 2,4-, 2,6-, and 2,4,6-bromophenol but not 3- or 2,3-bromophenol or monobrominated benzoates. It will not dehalogenate monochlorinated, fluorinated, or iodinated phenols or chlorinated benzoates. Together with its physiological characteristics, its 16S rRNA gene sequence places it in the genus Desulfovibrio. The average growth yield of strain TBP-1 grown on a defined medium supplemented with lactate and 2,4,6-bromophenol is 3.71 mg of protein/mmol of phenol produced, and the yield was 1.42 mg of protein/mmol of phenol produced when 4-bromophenol was the electron acceptor. Average growth yields (milligrams of protein per millimole of electrons utilized) for Desulfovibrio sp. strain TBP-1 grown with 2,4,6-bromophenol, 4-bromophenol, or sulfate are 0.62, 0.71, and 1.07, respectively. Growth did not occur when either lactate or 2,4,6-bromophenol was omitted from the growth medium. These results indicate that Desulfovibrio sp. strain TBP-1 is capable of growth via halorespiration. (+info)Diversity of nitrous oxide reductase (nosZ) genes in continental shelf sediments. (3/2414)
Diversity of the nitrous oxide reductase (nosZ) gene was examined in sediments obtained from the Atlantic Ocean and Pacific Ocean continental shelves. Approximately 1,100 bp of the nosZ gene were amplified via PCR, using nosZ gene-specific primers. Thirty-seven unique copies of the nosZ gene from these marine environments were characterized, increasing the nosZ sequence database fourfold. The average DNA similarity for comparisons between all 49 variants of the nosZ gene was 64% +/- 10%. Alignment of the derived amino acid sequences confirmed the conservation of important structural motifs. A highly conserved region is proposed as the copper binding, catalytic site (CuZ) of the mature protein. Phylogenetic analysis demonstrated three major clusters of nosZ genes, with little overlap between environmental and culture-based groups. Finally, the two non-culture-based gene clusters generally corresponded to sampling location, implying that denitrifier communities may be restricted geographically. (+info)Dense populations of a giant sulfur bacterium in Namibian shelf sediments. (4/2414)
A previously unknown giant sulfur bacterium is abundant in sediments underlying the oxygen minimum zone of the Benguela Current upwelling system. The bacterium has a spherical cell that exceeds by up to 100-fold the biovolume of the largest known prokaryotes. On the basis of 16S ribosomal DNA sequence data, these bacteria are closely related to the marine filamentous sulfur bacteria Thioploca, abundant in the upwelling area off Chile and Peru. Similar to Thioploca, the giant bacteria oxidize sulfide with nitrate that is accumulated to +info)Environment and behavior of 2.5-million-year-old Bouri hominids. (5/2414)
The Hata Member of the Bouri Formation is defined for Pliocene sedimentary outcrops in the Middle Awash Valley, Ethiopia. The Hata Member is dated to 2.5 million years ago and has produced a new species of Australopithecus and hominid postcranial remains not currently assigned to species. Spatially associated zooarchaeological remains show that hominids acquired meat and marrow by 2.5 million years ago and that they are the near contemporary of Oldowan artifacts at nearby Gona. The combined evidence suggests that behavioral changes associated with lithic technology and enhanced carnivory may have been coincident with the emergence of the Homo clade from Australopithecus afarensis in eastern Africa. (+info)Rhodococcus erythropolis DCL14 contains a novel degradation pathway for limonene. (6/2414)
Strain DCL14, which is able to grow on limonene as a sole source of carbon and energy, was isolated from a freshwater sediment sample. This organism was identified as a strain of Rhodococcus erythropolis by chemotaxonomic and genetic studies. R. erythropolis DCL14 also assimilated the terpenes limonene-1,2-epoxide, limonene-1,2-diol, carveol, carvone, and (-)-menthol, while perillyl alcohol was not utilized as a carbon and energy source. Induction tests with cells grown on limonene revealed that the oxygen consumption rates with limonene-1,2-epoxide, limonene-1,2-diol, 1-hydroxy-2-oxolimonene, and carveol were high. Limonene-induced cells of R. erythropolis DCL14 contained the following four novel enzymatic activities involved in the limonene degradation pathway of this microorganism: a flavin adenine dinucleotide- and NADH-dependent limonene 1, 2-monooxygenase activity, a cofactor-independent limonene-1, 2-epoxide hydrolase activity, a dichlorophenolindophenol-dependent limonene-1,2-diol dehydrogenase activity, and an NADPH-dependent 1-hydroxy-2-oxolimonene 1,2-monooxygenase activity. Product accumulation studies showed that (1S,2S,4R)-limonene-1,2-diol, (1S, 4R)-1-hydroxy-2-oxolimonene, and (3R)-3-isopropenyl-6-oxoheptanoate were intermediates in the (4R)-limonene degradation pathway. The opposite enantiomers [(1R,2R,4S)-limonene-1,2-diol, (1R, 4S)-1-hydroxy-2-oxolimonene, and (3S)-3-isopropenyl-6-oxoheptanoate] were found in the (4S)-limonene degradation pathway, while accumulation of (1R,2S,4S)-limonene-1,2-diol from (4S)-limonene was also observed. These results show that R. erythropolis DCL14 metabolizes both enantiomers of limonene via a novel degradation pathway that starts with epoxidation at the 1,2 double bond forming limonene-1,2-epoxide. This epoxide is subsequently converted to limonene-1,2-diol, 1-hydroxy-2-oxolimonene, and 7-hydroxy-4-isopropenyl-7-methyl-2-oxo-oxepanone. This lactone spontaneously rearranges to form 3-isopropenyl-6-oxoheptanoate. In the presence of coenzyme A and ATP this acid is converted further, and this finding, together with the high levels of isocitrate lyase activity in extracts of limonene-grown cells, suggests that further degradation takes place via the beta-oxidation pathway. (+info)Role of methanogens and other bacteria in degradation of dimethyl sulfide and methanethiol in anoxic freshwater sediments. (7/2414)
The roles of several trophic groups of organisms (methanogens and sulfate- and nitrate-reducing bacteria) in the microbial degradation of methanethiol (MT) and dimethyl sulfide (DMS) were studied in freshwater sediments. The incubation of DMS- and MT-amended slurries revealed that methanogens are the dominant DMS and MT utilizers in sulfate-poor freshwater systems. In sediment slurries, which were depleted of sulfate, 75 micromol of DMS was stoichiometrically converted into 112 micromol of methane. The addition of methanol or MT to DMS-degrading slurries at concentrations similar to that of DMS reduced DMS degradation rates. This indicates that the methanogens in freshwater sediments, which degrade DMS, are also consumers of methanol and MT. To verify whether a competition between sulfate-reducing and methanogenic bacteria for DMS or MT takes place in sulfate-rich freshwater systems, the effects of sulfate and inhibitors, like bromoethanesulfonic acid, molybdate, and tungstate, on the degradation of MT and DMS were studied. The results for these sulfate-rich and sulfate-amended slurry incubations clearly demonstrated that besides methanogens, sulfate-reducing bacteria take part in MT and DMS degradation in freshwater sediments, provided that sulfate is available. The possible involvement of an interspecies hydrogen transfer in these processes is discussed. In general, our study provides evidence for methanogenesis as a major sink for MT and DMS in freshwater sediments. (+info)Molecular analysis of microbial community structures in pristine and contaminated aquifers: field and laboratory microcosm experiments. (8/2414)
This study used phylogenetic probes in hybridization analysis to (i) determine in situ microbial community structures in regions of a shallow sand aquifer that were oxygen depleted and fuel contaminated (FC) or aerobic and noncontaminated (NC) and (ii) examine alterations in microbial community structures resulting from exposure to toluene and/or electron acceptor supplementation (nitrate). The latter objective was addressed by using the NC and FC aquifer materials for anaerobic microcosm studies in which phylogenetic probe analysis was complemented by microbial activity assays. Domain probe analysis of the aquifer samples showed that the communities were predominantly Bacteria; Eucarya and Archaea were not detectable. At the phylum and subclass levels, the FC and NC aquifer material had similar relative abundance distributions of 43 to 65% beta- and gamma-Proteobacteria (B+G), 31 to 35% alpha-Proteobacteria (ALF), 15 to 18% sulfate-reducing bacteria, and 5 to 10% high G+C gram positive bacteria. Compared to that of the NC region, the community structure of the FC material differed mainly in an increased abundance of B+G relative to that of ALF. The microcosm communities were like those of the field samples in that they were predominantly Bacteria (83 to 101%) and lacked detectable Archaea but differed in that a small fraction (2 to 8%) of Eucarya was detected regardless of the treatment applied. The latter result was hypothesized to reflect enrichment of anaerobic protozoa. Addition of nitrate and/or toluene stimulated microbial activity in the microcosms, but only supplementation of toluene alone significantly altered community structures. For the NC material, the dominant subclass shifted from B+G to ALF, while in the FC microcosms 55 to 65% of the Bacteria community was no longer identifiable by the phylum or subclass probes used. The latter result suggested that toluene exposure fostered the proliferation of phylotype(s) that were otherwise minor constituents of the FC aquifer community. These studies demonstrated that alterations in aquifer microbial communities resulting from specific anthropogenic perturbances can be inferred from microcosm studies integrating chemical and phylogenetic probe analysis and in the case of hydrocarbon contamination may facilitate the identification of organisms important for in situ biodegradation processes. Further work integrating and coordinating microcosm and field experiments is needed to explore how differences in scale, substrate complexity, and other hydrogeological conditions may affect patterns observed in these systems. (+info)
Arundel Formation
1] "Geologic Map Legends". Coastal Plain Rocks and Sediments. Maryland Geological Survey. Archived from the original on 26 May ... "Geologic Unit: Arundel". National Geologic Map Database. USGS. Harris, Jerald D. (1998). "Large, Early Cretaceous theropods in ...
Tenjong Dendang Formation
The sediments were deposited during the Late Ordovician glaciation. The following fossils were reported from the formation: ... Coordinates on Wikidata, Geologic formations of Malaysia, Ordovician System of Asia, Paleozoic Malaysia, Hirnantian, Limestone ... The Tenjong Dendang Formation is a geologic formation in Malaysia. The band of graptolite- and trilobite-bearing shales ...
History of paleontology in the United States
"A Brief Summary of the Geologic History of Ohio", page 1. Madin; "3. Early Sediments: Oregon's first coast". Murray (1974); " ... Arkansas Geologic Survey. 2007. "A Brief Summary of the Geologic History of Ohio". GeoFacts. Number 23. Ohio Department of ... This was a major boon to his reputation as his research was foundational to understanding that interval of American geologic ... ISBN 0-691-11345-9. Madin, Ian P. "Oregon: A Geologic History." Interpretive Map Series 28. Oregon Department of Geology and ...
Futaba Group
Geologic groups of Asia, All stub articles, Geologic formation stubs, Japan geography stubs, Upper Cretaceous Series of Asia, ... It consists of both fluvial and shallow marine sediments. The plesiosaur Futabasaurus was found in this unit (specifically the ... The Futaba Group is a Late Cretaceous geologic group in Japan. Dinosaur remains are among the fossils that have been recovered ...
Prehistory of the United States
"A Brief Summary of the Geologic History of Ohio", page 1. Madin; "3. Early Sediments: Oregon's first coast". Murray (1974); " ... Arkansas Geologic Survey. 2007. "A Brief Summary of the Geologic History of Ohio". GeoFacts. Number 23. Ohio Department of ... The geologic turmoil on the west coast was maintained as the Pacific Plate continued to slide under the North American Plate. ... Powerful geologic forces began to fold and distort the rocks of Idaho, Utah, and Wyoming, beginning the processes that would ...
Siberian natural resources
This caused deposition of much fly ash in sediments across the world. See Fly ash#In the geologic record. The Siberian ...
La Herradura Formation
The sediments of the formation reflect a marine near-shore depositional environment. Cardozo, M. (1990). "The Copara ... Articles containing Spanish-language text, Geologic formations of Peru, Lower Cretaceous Series of South America, Cretaceous ... Metallotect in Central Peru: Geologic Evolution and Ore Formation". In Fontboté, L.; Amstutz, G.C.; Cardozo, M.; Cedillo, E.; ...
Escarpment Grit
doi:10.1007/s10040-007-0191-z. (Geologic formations of Zambia, Geologic formations of Zimbabwe, Triassic System of Africa, ... The formation is composed of fluvial sediments, mainly gritstones and coarse sandstones. Uranium is present in the Escarpment ... The Escarpment Grit is a Triassic geologic formation. It is also referred to as the Nyoka Grit. ... d'Engelbronner, E.R. (1996). "New palynological data from Karoo sediments, Mana Pools basin, northern Zimbabwe". Journal of ...
Great Sand Dunes National Park and Preserve
Sediments from the surrounding mountains filled the valley over geologic time periods. After lakes within the valley receded, ... Large amounts of sediment from the volcanic San Juan Mountains continued to wash down into these lakes, along with some sand ... Sediments from both mountain ranges filled the deep chasm of the valley, along with huge amounts of water from melting glaciers ... and in buried deposits indicates that some of the sediment has been washed down in torrential flash floods. In 2002, geologists ...
Paleoseismology
... looks at geologic sediments and rocks, for signs of ancient earthquakes. It is used to supplement seismic ... Paleoseismology is usually restricted to geologic regimes that have undergone continuous sediment creation for the last few ...
Tectonic phase
The result is a sequence of sediments that wedges out in one direction. This is usually the case on the margins of geologic ... When a tectonic phase occurred while sedimentation of new sediments continued, every new layer will have a slightly different ...
Geology of Pennsylvania
On the geologic map, "Trenton Gravel" is used to describe most of these sediments. However, much of the alluvial sediments that ... The sediments deposited in that sea are now located in the Great Valley section. (See below) The sediments placed from the ... The Pennsylvania Geologic Survey Physiographic Provinces and Sections of Pennsylvania The Geologic Story of Pennsylvania ... The sediments that were deposited in a sea between an island-arc and the Iapetus eventually were squeezed and deformed along a ...
Belloy Formation
Lexicon of Canadian Geologic Units. "Belloy Formation". Archived from the original on 2012-07-08. Retrieved 2009-02-12. ... John Group). It is unconformably overlies Mississippian sediments such as those of the Rundle Group. The Belloy Formation is ...
Washakie Formation
Carnegie Institution of Washington Publication 75:1-568 (Coordinates on Wikidata, Geologic formations of Colorado, Geologic ... The sediments fall in the Bridgerian and Uintan stages of the NALMA classification. The Washakie Formation has provided many ... The Washakie Formation is a geologic formation in northern Colorado and southern Wyoming. It preserves many mammal, bird, ...
Marlboro Mountains
After millions of years, these sediments have been titled and uplifted. Weathering has removed more easily eroded material ... Structurally, the Marlboro Mountains constitute a geologic formation known as a dip slope. The sedimentary layers comprising ... The Marlboro Mountains are primarily formed of shallow marine/delta sediments deposited during the late Ordovician, ... form an imposing geologic barrier just west of the Hudson River. They subdivide the relatively flat Hudson River Valley (a ...
Llallagua Formation
The formation comprises siliciclastic sediments. The fossil fauna suggests a warm water, nearshore current was active allowing ... Journal of Paleontology 56(5):1138-1170 (Coordinates on Wikidata, Geologic formations of Bolivia, Silurian System of South ... The Llallagua Formation is a Rhuddanian to Homerian geologic formation of western Bolivia. ...
Sadler effect
... can be preserved in sediments. Sedimentology Sequence stratigraphy Tectonic-climatic interaction Sadler, Peter M. "Sediment ... "The stratigraphic filter and bias in measurement of geologic rates." Geophysical Research Letters 38.11 (2011): L11405. Schumer ... Conversely, it also explains that the maximum sediment accumulation rates seen in the Cambrian at the start of the Phanerozoic ... The Sadler effect describes variation in apparent sediment accumulation rates and bed thicknesses back through time inherent to ...
Saw Mill Run
". "AMD and Sediment MDLs for Sawmill Run" (PDF). Retrieved 2009-05-24.[dead link] (All articles with bare URLs for citations, ... Pennsylvania, Geological Survey of (1887). Annual Report of the Geologic Survey of Pennsylvania for 1885-1887. p. 161. http:// ...
Mount Rushmore
Geologic Activity. National Park Service. Irvin, James R. Great Plains Gallery Archived July 20, 2006, at the Wayback Machine ( ... Subsequent erosion stripped the granite of the overlying sediments and the softer adjacent schist. Some schist does remain and ... The Black Hills area was uplifted as an elongated geologic dome. ... so the geologic formations of the heart of the Black Hills ... but were later buried by sandstone and other sediments during the Cambrian. Remaining buried throughout the Paleozoic, they ...
Lake
... and their sediments contain enormous quantities of geologic and paleontologic information concerning past environments. In ... These form where sediment from a tributary blocks the main river. These form where sediment from the main river blocks a ... All lakes are temporary over long periods of time, as they will slowly fill in with sediments or spill out of the basin ... A paired (black and white) layer of the varved lake sediments correspond to a year. During winter, when organisms die, carbon ...
Marine sediment
Turbidites are the geologic deposits of a turbidity current, which is a type of amalgamation of fluidal and sediment gravity ... Marine sediment, or ocean sediment, or seafloor sediment, are deposits of insoluble particles that have accumulated on the ... depth versus age Sediment-water interface Sedimentary rock Sediment transport Coastal sediment transport Coastal sediment ... the sediment becomes lithified. The various sources of seafloor sediment can be summarized as follows: Terrigenous sediment is ...
Alluvial fan
Such fan deposit likely contain the largest accumulations of gravel in the geologic record. Several kinds of sediment deposits ... permeable axial river sediments that alternate with fan sediment beds. Alluvium - Loose soil or sediment that is eroded and ... The sediments in an alluvial fan are usually coarse and poorly sorted, with the coarsest sediments found on the proximal fan. ... An alluvial fan is an accumulation of sediments that fans out from a concentrated source of sediments, such as a narrow canyon ...
Geology of Estonia
However, extensive sediments and landforms remain from the last 2.5 million years of the Quaternary. A thin blanket of ... The geology of Estonia is the study of rocks, minerals, water, landforms and geologic history in Estonia. The crust is part of ... The Haanja Heights and Otepaa Heights have up to 100 meters of glacial sediment, or up to 207 meters in the Abja Valley in the ... They are linked by the Latvian Saddle, which is shallower with two kilometers of sediment. Precambrian rocks do not outcrop ...
Rove Formation
Before the Rove sediments were laid down, during the Archean Eon, the Algoman orogeny added landmass along a border from South ... "Voyageurs National Park, Geologic History". National Park Service, Explore Geology: 1. Retrieved March 25, 2010. {{cite journal ... The Rove Formation is the youngest of the many Animikie layers; it consists of gently tilted fine-grained sediments. It is ... After the Rove Formation sediments were deposited, the Penokean orogeny added more land mass by accretion that occurred from ...
Paleontology in New Jersey
Local sediments were being eroded away rather than deposited from the Carboniferous to the Permian, so there are no rocks of ... Geologic units of New Jersey FossilsofNJ.com Paleoportal: New Jersey (Use mdy dates from April 2013, Commons category link is ... During the Triassic, New Jersey was experiencing geologic upheaval caused by the breakup of Pangaea. Rifts formed in the state ... Local reptiles would sometimes be preserved in the sediments of these lakes. During the Triassic, local dinosaurs left behind ...
Kilbourne Hole
Layers of ashfall and crumbling sediment also rise about 40 feet (12 m) high, on the south rim of the crater. Sand dunes have ... These have been closely studied by geologists to learn more about geologic processes deep underground. Hunt's Hole is a little ... These rest on the basalt flow where it is present or on older sediments. The ejecta at Kilbourne Hole contains dropstones and a ... A maar forms when rising magma encounters sediment beds saturated with groundwater. The magma heats the groundwater to the ...
Colorado National Monument
The park's geologic record preserves three different groups of rock and sediment. The oldest rocks are Early to Middle ... Geologic map of the Colorado National Monument and adjacent areas, Mesa County, Colorado: U.S. Geological Survey, Geologic ... Geologic formations with imbedded sand dunes, Protected areas established in 1911, Protected areas of Mesa County, Colorado, ...
Gravel
Sediments containing over 30% gravel that become lithified into solid rock are termed conglomerate. Conglomerates are widely ... Gravel occurs naturally throughout the world as a result of sedimentary and erosive geologic processes; it is also produced in ... Alluvial fans likely contain the largest accumulations of gravel in the geologic record. These include conglomerates of the ... ISBN 0-7167-3905-4. Krumbein, W. C. (1934). "Size frequency distributions of sediments". Journal of Sedimentary Petrology. 2 (4 ...
History of Saint Paul, Minnesota
Sometimes the sediment would be mixed with huge chunks of ice, which would leave voids, or kettles, in the soil. These kettles ... Geologic Atlas of Ramsey County, Atlas C-7 (Map) (1992 ed.). Minnesota Geological Survey, University of Minnesota. § Plate 2. ... S. S. Goldich (2), H. Baadsgaard (2 (1959). "Investigations in Radioactivity-Dating of Sediments". AAPG Bulletin. 43. doi: ...
Robert T. Hill
Geologic evolution of the non-mountainous topography of the Texas region. An introduction to the study of the Great Plains. The ... This land of reddish-brown sediments and rock has been carved by years of erosion, leaving behind scenic mesas and buttes that ... Geologic and geographic aspects of Mexico. The Mining World 25:370-372, 459, 540-541, 596. Hill, R.T. 1906. On the origin of ... Geographic and geologic features of Mexico. The Engineering and Mining Journal 72:501-564. Hill, R.T. 1901. The coast prairie ...
Ortega Formation
The Ortega Formation is a geologic formation that crops out in most of the mountain ranges of northern New Mexico. Detrital ... may be a result of deep weathering processes acting on the original sediment beds under unusual Proterozoic conditions. The ...
Redwall Limestone
Geologic formations of Arizona, Geologic formations of Utah, Carboniferous Arizona, Carboniferous geology of Utah, ... disconformity characterized by deeply incised paleovalleys and deep paleokarst depressions that are often filled by sediments ...
Geology of Indonesia
The various formations in the Indonesian Archipelago and New Guinea's Torres Strait form geologic choke points to shipping and ... Devonian limestones were found in Telen River, East Kalimantan, as fragments within Paleogene clastic sediments. Eastern ...
Strath
... the original strath surface may be buried under fresh sediments and become part of the geologic record. For example, at least ... If a change in sedimentation rates results in renewed deposition of sediments (aggradation) in a strath valley, ... but it may also correspond to a former base level now preserved in the geologic record. When a river in a strath valley is ... "Field evidence for climate-driven changes in sediment supply leading to strath terrace formation". Geology. 37 (5): 467-470. ...
Fractional crystallization (geology)
Geologic process in formation of some igneous rocks Layered intrusion Petrology The Study of Igneous...Rocks, Loren A. Raymond ... "Melting relations of muscovite-granite to 35 kbar as a model for fusion of metamorphosed subducted oceanic sediments". ...
Parga Formation
The sediments of the formation were deposited during the Late Oligocene and Middle Miocene epochs. The formation's lower ... CS1 Spanish-language sources (es), Coordinates on Wikidata, Articles containing Spanish-language text, Geologic formations of ... It is overlain across an angular unconformity by Pliocene or Quaternary sediments. The formation is intruded by porphyritic ...
Temuco Formation
It overlies the Bahía Mansa Metamorphic Complex and underlies sediments of Holocene age. The formation is thought to represent ... Geologic formations of Chile, Miocene Series of South America, Oligocene Series of South America, Eocene Series of South ...
Coyote Creek State Park
New mountain sediments formed a vast alluvial plain. 8 million years ago a series of volcanic eruptions took place to the east ... "Coyote Creek State Park". Virtual Geologic Tour of New Mexico. New Mexico Bureau of Geology and Mineral Resources. 2008. ... 70 million years ago the Laramide orogeny uplifted the Sangre de Cristo Mountains, steeply tilting the earlier sediments down ... Upon hitting the softer Pennsylvanian sediments, however, the creek began carving downward, creating a valley with a steep east ...
Cuyahoga River
The river is a relatively recent geologic formation, formed by the advance and retreat of ice sheets during the last ice age. ... The Ohio EPA estimated removal of the dam would cost $5-10 million, and removal of the contaminated sediments, a further $60 ... Marotta, Eric (November 2, 2022). "Site prep for Gorge Dam sediment disposal may start this month". Akron Beacon Journal. ... the sediment upstream of the dam is expected to contain hazardous chemicals, possibly including heavy metals and PCBs. ...
Paleontology in Kentucky
From the start of the Permian to the Pleistocene, there is a large gap in the geologic record, although the gap is interrupted ... Picconi (2003); "Ice Age environments recorded by unconsolidated sediment", page 101. Mayor (2005); "Introduction: Marsh ... Like the Cretaceous, the geologic record of Kentucky contains deposits left on both land and sea during the Tertiary. Also like ... The geologic column of Kentucky contains rocks deposited during the Ordovician, Silurian, Devonian, Mississippian and ...
Katberg Formation
The bone beds are almost always overlain by mudstone infilled with sandstone and capped by other coarse-grained sediments. This ... Geologic formations of South Africa, Triassic System of Africa, Triassic South Africa, Induan Stage, Olenekian Stage, Sandstone ...
Grand Teton National Park
Keller, Lynn (2010). "Geologic Features and Processes" (PDF). Grand Teton National Park and John D. Rockefeller Jr. Memorial ... Erosion of the range provided sediment in the valley so the topographic relief is only 7,700 ft (2,300 m). Jackson Hole is ... Memorial Parkway Geologic Resources Inventory Report. National Park Service. pp. 8-9. Archived (PDF) from the original on ... "Geologic Resources Inventory Report" (PDF). Natural Resource Report NPS/NRPC/GRD/NRR-2010/230. National Park Service. 2010. ...
Gastineau Channel
In the geologic case, that scenario happens very slowly. Rates of isostatic rebound throughout SE Alaska vary from 0.1 to 1.5 ... rebound following the retreat of glacial ice sheets Sedimentation and infilling of the Gastineau Channel by silty sediment ...
California flood of 1605
United States Geological Survey sediment research revealed that the 1605 flood deposited a layer of silt two inches thick at ... In addition to this event, geologic evidence indicates that other "megafloods" occurred in the California region in the ...
Landen Formation
The Landen Formation consists of shallow marine and lagoonal sediments (mostly clay, sandy clay and marl) from the late ... Geologic formations of the Netherlands, Eocene Series of Europe, Paleocene Series of Europe, Paleogene Netherlands, All stub ...
Melbourne Formation
Tumblagooda Sandstone, Silurian geologic formation in Western Australia Yea Flora Fossil Site, Silurian fossil site in Victoria ... Schleiger, N.W., 1974, Statistical methods for analysis and mapping of flysch-type sediments., Sedimentology, 21(2), p223-249 ( ... The Melbourne Formation is a geologic formation in Victoria, Australia. It preserves fossils dating back to the Ludlow epoch of ... Articles with short description, Short description matches Wikidata, Coordinates on Wikidata, Geologic formations of Australia ...
Volcanic rock
... s and sediment that form from magma erupted into the air are called "volcaniclastics," and these are technically ... "Global geologic maps are tectonic speedometers-Rates of rock cycling from area-age frequencies". Geological Society of America ... and in nature volcanic rocks grade into hypabyssal and metamorphic rocks and constitute an important element of some sediments ...
Pinole Creek
The watershed follows the regional geologic northwest-southeast orientation, similar to the orientation of the Berkeley Hills, ... Pinole Creek Watershed Sediment Source Assessment. A technical report of the Regional Watershed Program, San Francisco Estuary ...
Olympic-Wallowa Lineament
Dragovich, J. D.; Anderson, M. L.; Walsh, T. J.; Johnson, B. L.; Adams, T. L. (2007), Geologic map of the Fall City 7.5-minute ... and a confusing expression in both rock millions of years old and glacial sediments only 16,000 years old. Geological ... 2000), Geologic map of the Snoqualmie Pass 60 minute by 30 minute quadrangle, Washington, U.S. Geological Survey, scale 1: ... 2.0.CO;2. Haugerud, R. A.; Tabor, R. W. (2009), Geologic Map of the North Cascade Range, Washington, U.S. Geological Survey, 2 ...
Ogallala Aquifer
The aquifer is part of the High Plains Aquifer System, and resides in the Ogallala Formation, which is the principal geologic ... Erosion of the Rockies provided alluvial and aeolian sediment that filled the ancient channels and eventually covered the ... Retrieved from: http://geology.gsapubs.org/content/16/3/203.short Diffendal, R. F. (1984). Comments on the geologic history of ...
Diagenesis
After deposition, sediments are compacted as they are buried beneath successive layers of sediment and cemented by minerals ... The study of diagenesis in rocks is used to understand the geologic history they have undergone and the nature and type of ... Grains of sediment, rock fragments and fossils can be replaced by other minerals (e.g., calcite, siderite, pyrite, marcasite ... Increased pressure and temperature only start to play a role as sediments become buried much deeper in the Earth's crust. In ...
Central Oregon Coast Range
In the southern part of the range the bedrock is overlaid by Eocene age turbidite sediments and river sediment. The active ... Portions of this include marine fossils in the geologic record. Sandstone and shale are also present in the sections of the ... "Regional Geologic Setting". Portland State University. Archived from the original on July 14, 2007. Retrieved March 27, 2018. ...
Naturally occurring radioactive material
D. Atoufi, Hossein; Lampert, David J. (2020). "Impacts of Oil and Gas Production on Contaminant Levels in Sediments". Current ... TENORM.com R. Stephen Fisher (1998). "Geologic and Geochemical Controls on Naturally Occurring Radioactive Materials (NORM) in ...
Sharon Mosher
Macquarie ridge is unique as these sediments are easily accessible and therefore easy to study. Through this research Dr. ... International Geologic Correlation Program (1987 - 1990) - Chairman, Division of Structural Geology and Tectonics, Geological ...
Flood basalt
... s are often interbedded with sediments, typically red beds. The deposition of sediments begins before the first ... They must also explain the similar compositions and tectonic settings of flood basalts erupted across geologic time and the ... They are also catastrophic events, which likely contributed to many mass extinctions in the geologic record. The extrusion of ... Flood basalts show a considerable degree of chemical uniformity across geologic time, being mostly iron-rich tholeiitic basalts ...
Franciscan Complex
Franciscan sediments contain a sparse, but diverse assemblage of fossils. The most abundant fossils by far are microfossils, ... The Franciscan Complex or Franciscan Assemblage is a geologic term for a late Mesozoic terrane of heterogeneous rocks found ... As oceanic crust descended beneath the continent, ocean floor basalt and sediments were subducted and then tectonically ... Coherent terranes are internally consistent in metamorphic grade and include folded and faulted clastic sediments, cherts and ...
Gething Formation
The sediments are mostly of non-marine origin, deposited in deltaic and coastal plain settings. The Gething Formation is ... Lexicon of Canadian Geologic Units. "Gething Formation". Archived from the original on 2013-02-21. Retrieved 2009-02-07. ...
Level Mountain
Volcanism in this geologic province can be traced as far back as 20 million years ago with the emplacement of alkali basalt in ... Tuffaceous pertains to sediments which contain up to 50% tuff. Glacial erratics are glacially deposited rocks differing from ...
Coyote Butte Limestone
The Coyote Butte Limestone (OR085) is a geologic formation in Oregon. It preserves fossils dating back to the Sakmarian to ... To imply that the limestone belonged to the same tectonic-sedimentary package as the oceanic sediments (Dickinson and Thayer, ... Butte Formation as deposited as local limestone in a volcanic island chain and then admixed to the deformed oceanic sediments ... to imagine the Coyote Butte Formation as being introduced as a late-stage structural event to deforming oceanic sediments in ...
Geologic Sediments | Profiles RNS
"Geologic Sediments" by people in this website by year, and whether "Geologic Sediments" was a major or minor topic of these ... "Geologic Sediments" is a descriptor in the National Library of Medicines controlled vocabulary thesaurus, MeSH (Medical ... Below are the most recent publications written about "Geologic Sediments" by people in Profiles. ... Below are MeSH descriptors whose meaning is more general than "Geologic Sediments". ...
Subjects: Geologic Sediments - Digital Collections - National Library of Medicine Search Results
Start Over You searched for: Subjects Geologic Sediments ✖Remove constraint Subjects: Geologic Sediments ... Geologic Sediments. Brazil 2. On the subsidence of particles in liquids Author(s): Brewer, William Henry, 1828-1910, author ... Geologic Sediments 3. Extracts from the Proceedings of the Academy of Natural Sciences of Philadelphia, of papers ... Geologic Sediments. Mollusca -- classification 4. Remarks upon sedimentation in the Cincinnati group ...
The Geologic Story of Yosemite National Park (1987), "Rocks, the building materials," by N. King Huber
of El Portal are ancient marine sediment that has been metamorphosed. (Fig. 23) ... Next: Genesis of Yosemites rocks • Contents • Previous: Geologic overview The Geologic Story of Yosemite National Park (1987) ... Few of those details can be shown on the generalized geologic map in this volume (pl. 1), but a geologic map at a much larger ... An even larger scale geologic map is available for Yosemite Valley (Calkins, 1985; see section above entitled "Geologic Maps of ...
Sediment organic carbon and temperature effects on methylmercury concentration: A mesocosm experiment - PubMed
To investigate the interactions between sediment organic carbon and temperatu … ... Geologic Sediments / chemistry* Actions. * Search in PubMed * Search in MeSH * Add to Search ... sediment MeHg (a) and %MeHg (b) mean +/− st. dev. across temperature and sediment carbon (HOC-natural sediment, LOC-sand ... across temperature and sediment (HOC-unmanipulated; LOC-sand addition) treatments. LOC sediment treatments represent a higher ...
In-situ sorbent amendments: a new direction in contaminated sediment management - PubMed
span, The accumulation of harmful and persistent organic molecules in soils and sediment is a major environmental concern. ... Geologic Sediments / chemistry* Actions. * Search in PubMed * Search in MeSH * Add to Search ... In-situ sorbent amendments: a new direction in contaminated sediment management Upal Ghosh et al. Environ Sci Technol. 2011. . ... In-situ sorbent amendments: a new direction in contaminated sediment management Upal Ghosh 1 , Richard G Luthy, Gerard ...
Pleistocene Megafauna in Beringia (U.S. National Park Service)
The New Geologic Epoch
Publication Detail
MeSH Terms: Bays; Cyclonic Storms*; Disasters*; Environmental Monitoring; Geologic Sediments; Humans; Polycyclic Aromatic ... a disaster event that led to broad redistribution of chemically-contaminated sediments, including deposition of the sediment on ... We used sediment samples (n = 46) from Galveston Bay and the Houston Ship Channel (GB/HSC) areas after hurricane Harvey, ... Title: Potential Human Health Hazard of Post-Hurricane Harvey Sediments in Galveston Bay and Houston Ship Channel: A Case Study ...
USGS Report Series 2015-1153: Sea-Floor Texture and Physiographic Zones of the Inner Continental Shelf From Salisbury to Nahant...
Sediment classes are shown in figure 8. %, percent.. Figure 14. Pie chart showing the percentage of each primary sediment unit ... Generalized geologic map created by combining previously published stratigraphic interpretations within the study area and new ... Sediment classes are shown in figure 8. %, percent.. Figure 13. Inner continental shelf sediment textures within western ... Inner continental shelf sediment textures between Cape Ann and New Hampshire with bottom photographs A-D showing sediment ...
Flow transformations in sediment gravity flows | Geology | GeoScienceWorld
Sedimentologic Consequences of Convulsive Geologic Events. Sonar images of the path of recent failure events on the continental ... Sediment gravity flows (subaerial or subaqueous) are those in which movement is driven by gravity and the sediment motion moves ... Flow transformations in sediment gravity flows Richard V. Fisher Richard V. Fisher ... Modern submarine sediment slides and their implications for melange and the Dunnage Formation in north-central Newfoundland ...
Airborne hunt for faults in the Portland-Vancouver area | U.S. Geological Survey
Glossary | Water-related Topics | Healthy Water | CDC
NIOSHTIC-2 Search Results - Full View
Encyclopedia of Soil Science - CRC Press - Literati by Credo
Geologic Carbon Capture and Storage / Sean I. Plasynski, John T. Litynski, Timothy R. Carr, Howard G. McIlvried, and Rameshwar ... Sediment: Influence on Aquatic Life / Suzanne M. Gray. *Sedimentation Control and Erosion: Engineering Techniques / Jose Miguel ... Carbon Sequestration: Sediments / Eswaran Padmanabhan. *Carbon Sequestration: Semiarid Regions of India / Cherukumalli ...
MASC 634 MARINE BIOGEOCHEMISTRY | Department of Marine and Fisheries Sciences
More evidence against so-called paleokarst
Other geologic evidences, notably indicators of sediment cave-in, demonstrate that the overlying sedimentary rock was already ... Thus, this alleged indicator of long periods of geologic time turns into evidence for extensive geologic catastrophism during ... Geologic alternatives to paleokarst. Silvestru25 explains that aqueous solutions can exist at considerable depths because of ... For instance, cavities and breccias can be formed at depth in sediments by bubbles of gas rising from below.26 ...
Water appeared on bed of inactive river: Geologist | Chandigarh News - Times of India
NIOSHTIC-2 Search Results - Full View
Kiosk Panel 7: Glacial & Geological History | Red Wing, MN
Anthropocene: The human age | Nature
"The geologic timescale, in my view, is one of the great achievements of humanity," says Michael Walker, a Quaternary scientist ... Through mining activities alone, humans move more sediment than all the worlds rivers combined. Homo sapiens has also warmed ... In the deep sea, he notes, the layer of sediments representing the past 70 years would be thinner than 1 millimetre. An even ... Geologists thousands of years in the future would be able to identify the boundary by looking in the sediments for the ...
Eocene epoch | Infoplease
... second epoch of the Tertiary period in the Cenozoic era of geologic time, from approximately 54.9 to 38 million years ago. The ... Eocene epoch ē´əsēn˝ [key], second epoch of the Tertiary period in the Cenozoic era of geologic time, from approximately 54.9 ... There was also extensive sediment deposition in the Rocky Mt. region. Eocene sedimentary formations along the Atlantic-Gulf ...
MeSH Browser
GEOL SEDIMENTS. Entry Term(s). Geologic Sediment Marine Oil Snow Marine Snow Sediment, Geologic Sediments, Geologic Sediments, ... Sediments, Marine Narrower Concept UI. M0028393. Terms. Sediments, Marine Preferred Term Term UI T056743. Date01/09/1995. ... Geologic Sediments Preferred Term Term UI T056747. Date01/01/1999. LexicalTag NON. ThesaurusID NLM (1996). ... Geologic Sediments Preferred Concept UI. M0028394. Scope Note. A mass of organic or inorganic solid fragmented material, or the ...
blog Archives - Utah Geological Survey
Surficial deposits include alluvial fans, fluvial sediments of the Sevier River, and deltaic sediments of Lake Bonneville. ... Several specialized programs comprise the UGS: Data Management, Energy & Minerals, Geologic Hazards, Geologic Information & ... GEOLOGIC MAP OF PART OF THE LEES FERRY AREA, GLEN CANYON NATIONAL RECREATION AREA, COCONINO COUNTY, ARIZONA. D.A. Phoenix ... PROVISIONAL GEOLOGIC MAP OF THE TINTIC MOUNTAIN QUADRANGLE, JUAB AND UTAH COUNTIES, UTAH. Jeffrey D. Keith, David G. Tingey, ...
Diamonds in Virginia
All Virginia diamonds were found in unconsolidated sediments, rather than in their original geologic context. They were carried ... According to current geologic interpretation, diatremes less than 50 million years old are too young to be source rocks for ... If eroded from Warren County in last few million years, diamonds would have been deposited as part of alluvial sediments within ... must either have been brought down the James River and deposited with some of its sediments, or have been introduced ...
The Primitive atmosphere
Considering the geologic evidence for oxidized sediments, he was not convinced that surface oxides were responsible for ... Abelson claims that a methane atmosphere would have left some trace of its existence in the oldest rocks of the geologic record ... Thus there is a uniformitarian geologic case for an oxidizing atmosphere preceding the photosynthetic organisms, which would ... in excess of 1.5 billion arbitrary geologic years, (A.G. Yr ) citing as example the Roraima formation 1.7 billion (A.G. Yr ). ...
Underestimating nuclear accident risks: Why are rare events so common? - Bulletin of the Atomic Scientists
Put the risk in a broader perspective. Part of the explanation may lie in the inherent difficulty of reducing geologic data and ... This event, which is also clearly recorded in the coastal sediment of the Sendai plain, extended inland about four kilometers ... This picture of nuclear power in Japan takes on special significance when it is put into the geologic context of the Japanese ... Reconsider the definition of "credible." From a geologic perspective, the earthquake and its great magnitude should not have ...
Channels Stream Valleys and Floodplains - Sediment, Streams, Bankfull, and Increase - JRank Articles
... stream channels represent the continually changing response of the stream system to changing conditions through over geologic ... For example, an influx of fine-grained sediment can clog the gravel beds in which salmon and trout spawn. The effect of ... As a consequence, the channel and stream gradient change to accommodate the increased sediment load, which may in term have ... See also Hydrologic cycle; Hydrology; Landform; Sediment and sedimentation; Sedimentary environment; Stream capacity and ...
Sediment or sedimentary rock (MTTs;0)
Fine-grained sediment2
Deposition3
- We used sediment samples (n = 46) from Galveston Bay and the Houston Ship Channel (GB/HSC) areas after hurricane Harvey, a disaster event that led to broad redistribution of chemically-contaminated sediments, including deposition of the sediment on shore due to flooding. (nih.gov)
- There was also extensive sediment deposition in the Rocky Mt. region. (infoplease.com)
- Because streams are the products of continual change, many stream valleys contain one or more generations of stream terraces that represent alternating stages of sediment deposition (valley filling) and erosion (stream incision). (jrank.org)
Sedimentary3
- Other geologic evidences, notably indicators of sediment cave-in, demonstrate that the overlying sedimentary rock was already present when solution features such as vugs, sinkholes, and intra-formational breccias formed. (creation.com)
- Second, and as a corollary, the solution cavities of the alleged karstic carbonate horizon must clearly point to post-solutional infilling through sedimentary processes (i.e. the marine transgression), rather than post-solutional infilling through secondary processes such as cave-ins of existing overburden (sediment or sedimentary rock). (creation.com)
- Sediment or sedimentary rock (no unique unit description on map). (usgs.gov)
20231
- The New Geologic Epoch is the annual ecoartspace members online exhibition + book for 2023. (jotform.com)
Subaerial2
- Sediment gravity flows (subaerial or subaqueous) are those in which movement is driven by gravity and the sediment motion moves the interstitial fluid (gas or liquid). (geoscienceworld.org)
- Furthermore, uniformitarians often infer an ancient surface of prolonged exposure solely from petrographic and isotopic data, without any collateral geologic evidence of subaerial exposure! (creation.com)
Tertiary1
- Eocene epoch ē´əsēn˝ [ key ] , second epoch of the Tertiary period in the Cenozoic era of geologic time, from approximately 54.9 to 38 million years ago. (infoplease.com)
Deposits2
- The stratigraphic unit names and resolution of these studies differed, but the origin and texture of the deposits can be readily combined into a generalized geologic map (fig. 5) to correlate with sediment textures and physiographic zones presented in this study. (usgs.gov)
- Normally, decisions about the geological timescale are made solely on the basis of stratigraphy - the evidence contained in layers of rock, ocean sediments, ice cores and other geological deposits. (nature.com)
MeSH1
- Geologic Sediments" is a descriptor in the National Library of Medicine's controlled vocabulary thesaurus, MeSH (Medical Subject Headings) . (uchicago.edu)
Classification2
- This classification differs from the one previously in use and thus results in many contradictions with the rock names in earlier geologic writings on the Sierra Nevada. (ca.us)
- Barnhardt and others (1998) bottom-type classification based on four basic sediment units: Rock (R), Gravel (G), Sand (S), and Mud (M). If one of the basic sediment units represents more than 90 percent of the texture, only its uppercase letter is used. (usgs.gov)
Floodplains2
- An aquifer formed as a result of sediments deposited in river channels or on floodplains. (cdc.gov)
- Stream valleys, channels, and floodplains form complicated systems that evolve through time in response to changes in sediment supply, precipitation , land use , and rates of tectonic uplift affecting a drainage basin . (jrank.org)
Gravel1
- A geologic formation or part of a formation (such as gravel, sand, or porous stone) that supplies water to wells or springs. (cdc.gov)
Organic1
- The accumulation of harmful and persistent organic molecules in soils and sediment is a major environmental concern. (nih.gov)
Marine1
- These studies range from freshwater to marine sediments and cover a wide range of benthic organisms. (nih.gov)
Evidence1
- Thus, this alleged indicator of long periods of geologic time turns into evidence for extensive geologic catastrophism during the Flood. (creation.com)
Climate2
- Stream channels can change in form over time as a function of climate, precipitation, sediment supply, tectonic activity, and land use changes. (jrank.org)
- Caves' special features are the product of various types of rock, their geologic setting, local climate, and time. (earthsciweek.org)
Fossil1
- That's because the fossil and geologic records are uneven, preserved in some places but not others. (smithsonianmag.com)
Tend1
- Channels with large bed loads of coarse-grained materials, steep gradients, and banks composed of easily eroded sediments tend to be shallow and braided, meaning that flow occurs through many anastomosing channels separated by bars or islands. (jrank.org)
Processes1
- The "Dewey" or "Manchester Diamond" was found in Manchester/Richmond, but it could have been created through ancient geologic processes in a place outside of the James River watershed and even on the other side of the Mississippi River. (virginiaplaces.org)
Exposure1
- Conceptual model of how sorbent amendment of sediment reduces contaminant exposure pathways of benthic organism accumulation and flux from the sediment bed. (nih.gov)
Erosion3
- Paleokarst refers to features within a rock that supposedly indicate a protracted period of surface and near-surface erosion that occurred before the next layer of sediment was deposited. (creation.com)
- Increased precipitation or human activities, for example, heavy grazing or clear-cut logging, can lead to increased erosion or mass wasting that subsequently increase the amount of sediment delivered to streams. (jrank.org)
- The effect of urbanization is generally to increase storm runoff and the erosive power of streams because impervious areas (principally pavement and rooftops) decrease the amount of water that can infiltrate into the soil while at the same time decreasing the amount of sediment that is available for erosion before runoff enters stream channels. (jrank.org)
Flow1
- the direction of flow was broadly from north to south indicating that the source of the river carrying these sediments must have been in the Himalayas,' he has written and added, 'The overall mineral assemblage is suggestive of a higher Himalayan source comprising metamorphic rocks. (indiatimes.com)
Soil1
- Their Feature concludes with what more needs to be done to minimize anthropogenic chemical blights in soil and sediments. (nih.gov)
Rock2
- A total of 964 stream sediments and 42 rock samples were analyzed. (cdc.gov)
- Results of the elemental ratios critical of provenance compared to those of felsic and basic derived sediment of UCC and PAAS values suggests a felsic source rock. (bvsalud.org)
Chemical1
- The sediments are enriched in SiO2 and depleted in Na2O, CaO and TiO2.Chemical index of weathering (CIW) of the sample suggests intense recycling and high degree of weathering in a humid climatic condition. (bvsalud.org)
Samples3
- green dots) and sediment samples collected within the study area and used to aid interpretations. (usgs.gov)
- Taking the core samples The core sample The Blue Hole acts as a giant sediment trap. (cambrianfoundation.org)
- N. fowleri and thermophilic amebae were detected in recreational water and sediment samples throughout the facility. (cdc.gov)
Major1
- This graph shows the total number of publications written about "Geologic Sediments" by people in this website by year, and whether "Geologic Sediments" was a major or minor topic of these publications. (uchicago.edu)
Time2
- A karst topography developed on top of Madison Group sediments near the close of Mississippian [Lower Carboniferous] time, and solution phenomena such as sinkholes and "bedding plane solution cavities", here referred to as bedding cavities , were abundant. (creation.com)
- Thus, stream channels represent the continually changing response of the stream system to changing conditions through over geologic and human time spans. (jrank.org)
Studies2
- It needs to be emphasized that the batholith is composite, a fact not perceived by the earliest geologic studies. (ca.us)
- Percent reduction ranges of aqueous equilibrium concentration and contaminant biouptake in different laboratory studies of activated carbon amendment to sediments and soils from the field. (nih.gov)
Data1
- Potential Human Health Hazard of Post-Hurricane Harvey Sediments in Galveston Bay and Houston Ship Channel: A Case Study of Using In Vitro Bioactivity Data to Inform Risk Management Decisions. (nih.gov)
Formation1
- ABSTRACT: An integrated geochemical and sedimentological study of the Campano- Maastrichtian sediment of Ajali and Owelli Formation exposed within the southern portion of the Anambra basin was undertaken to determine the sandstone provenance, tectonic setting, and paleo-weathering conditions. (bvsalud.org)
Sand1
- Much of what paleontologists have studied comes from places where sediment was being laid down-like sand in oceans or silt carried by streams. (smithsonianmag.com)
River2
- Geologic hazards in the Portland-Vancouver area include faults entirely hidden by river sediments, vegetation, and urban development. (usgs.gov)
- Chaudhry's report maintains that the sediments in the paleo channel are of fluvial nature and accumulated in the river channel in the geologic past. (indiatimes.com)
Origin1
- Distinguishing between individual plutons that represent separate episodes of intrusion and solidification of magma is the key to understanding the origin and complex geologic history of the batholith. (ca.us)
Area3
- Generalized geologic map created by combining previously published stratigraphic interpretations within the study area and new interpretation for western Massachusetts Bay. (usgs.gov)
- The study area is divided into four geologic terranes based on a review of the available literature. (cdc.gov)
- This CD contains a digital dataset of a geologic map of the Lees Ferry area, Arizona, and is one of several maps that together provide complete GIS geologic map coverage of Glen Canyon National Recreation Area. (utah.gov)
Written1
- Below are the most recent publications written about "Geologic Sediments" by people in Profiles. (uchicago.edu)
Stream2
- As a consequence, the channel and stream gradient change to accommodate the increased sediment load, which may in term have adverse effects on aquatic habitat . (jrank.org)
- When a stream exceeds bankfull discharge, floodwater will begin to spill out onto the adjacent flat areas where its depth and velocity decrease significantly, causing sediment to fall out of suspension. (jrank.org)
Depth1
- Barnhardt and others (2006) published a depth to sediment thickness map, which was used to identify areas of outcropping bedrock on the inner continental shelf between Nahant and Gloucester, Massachusetts. (usgs.gov)
Areas1
- Areas of high backscatter intensity (light tones) have strong acoustic reflections and suggest boulders, gravels, and generally coarse sea-floor sediments. (usgs.gov)
View1
- The geologic timescale, in my view, is one of the great achievements of humanity," says Michael Walker, a Quaternary scientist at the University of Wales Trinity St David in Lampeter, UK. (nature.com)
Great1
- From a geologic perspective, the earthquake and its great magnitude should not have been a surprise. (thebulletin.org)
Event2
- The fact that such earthquakes occur infrequently over historical periods does not explain why the Fukushima nuclear power plant was not designed to withstand this type of geologic event. (thebulletin.org)
- This event, which is also clearly recorded in the coastal sediment of the Sendai plain, extended inland about four kilometers from the coast. (thebulletin.org)