Rivers geologic sediments. Medical search. Frequent questions

In surveying James Creek in northwestern Mississippi, researchers from the ARS Channel Watershed and Processes Research Unit (CWPRU) coupled computer modeling with river-related geologic studies to determine how soil erosion and sediment loading within a watershed change over time. (usda.gov)
MIT scientists have found that river erosion can promote biodiversity in areas with little tectonic activity. (scitechdaily.com)
The study, centered on the Tennessee River Basin, revealed that erosion diversified populations of a fish species, potentially indicating a similar impact on other species. (scitechdaily.com)
In a paper published recently in the journal Science , the researchers report that river erosion can be a driver of biodiversity in these older, quieter environments. (scitechdaily.com)
An MIT study of the freshwater greenfin darter fish suggests river erosion can be a driver of biodiversity in tectonically inactive regions. (scitechdaily.com)
The greenfin darter may not be the only species to diversify as a consequence of river erosion. (scitechdaily.com)
Surface processes (e.g., soil formation, runoff, sediment transport, river incision and deposition, glacial erosion and deposition) not only govern the evolution of the landscapes around us, but also constitute the dynamic link between the geologic record and environmental conditions (climate, lithology, vegetative cover, tectonics). (asu.edu)
This leads to increased stress and loss of the plant communities, and eventually erosion and sediment transport out of the inner marsh areas. (lacoast.gov)
One of the group's current research projects aims to improve our understanding of the dynamic interactions between channel migration (rate and pattern of erosion) and point bar development (internal structure and sedimentology) on meandering rivers with complex planform geometry. (lsu.edu)
Barn Bluff and Sorin's Bluff survived as islands in the large glacial water river because their hard overlying Oneota Dolomite prevented their erosion. (red-wing.org)
There often then followed, it is claimed, a lengthy time in which erosion of that land surface may have then removed large amounts of the previously deposited sediments. (creation.com)
Indeed, the display on the Grand Canyon in the Museum of Northern Arizona in Flagstaff diagrammatically shows how the land surface in the Grand Canyon area must have subsided, been covered by the sea while sediments were being deposited, and then uplifted again with erosion taking place. (creation.com)
The presence of each unconformity is physical evidence that the Colorado Plateau (the area taking in the Grand Canyon) experienced consolidation of sediments, uplift, and possibly gentle tilting, weathering of the uplifted surface to form soil, and erosion by streams and wind before the sediments of the next formation (rock layer) were deposited. (creation.com)
There must have been several of these episodes of consolidation, uplift, weathering, and erosion-a conclusion clearly at variance with the theory that the sediments were deposited during a year-long global flood. (creation.com)
Each twist and zigzag of the river tells a different geologic story about the power of erosion. (nasa.gov)

Lake Gosiute was a large body of water surrounded by subtropical forest, the lake being part of a lacustrine complex that occupied the Green River Basin. (researchgate.net)
lacustrine complex that occupied the Green River Basin. (researchgate.net)
They make their case in the southern Appalachians, and specifically the Tennessee River Basin, a region known for its huge diversity of freshwater fishes. (scitechdaily.com)
The changing landscape of the Tennessee River Basin pushed a species of fish known as the greenfin darter into different tributaries of the river network. (scitechdaily.com)
Near brought a curious observation to the team: a habitat distribution map of the greenfin darter showing that the fish was found in the Tennessee River Basin - but only in the southern half. (scitechdaily.com)
The core of the Red River Basin is the 'Gorge' which has been rightly designated a national 'Geological Area. (redrivergorge.com)
Discussion of current research or advanced topics in landscape evolution, surface hydrology, mechanics of sediment transport, basin analysis, or experimental geomorphology. (asu.edu)
The repetitive occurrence of these pulses of sediment due to change in the Mississippi Rivers course helped to build the systems of cheniers (oak ridges) in the basin. (lacoast.gov)
Freshwater inflow to the basin occurs primarily through these lakes via the Calcasieu and Sabine rivers. (lacoast.gov)
The sediments that can be seen at Angel Peak National Recreation area were eroded off of the old Laramide highlands and deposited in the basin 50 to 65 million years ago. (nmt.edu)
More recently, over the course of the last 5 million years (or less), the westward-draining San Juan River, a tributary to the Colorado River, has eroded the rocks of the San Juan Basin. (nmt.edu)
Combined with human demands, a multi-year drought in the Upper Colorado River Basin caused a dramatic drop in Lake Powell. (nasa.gov)
But the basic geology is that it's a basin, and over 500 million years, the center of Michigan, which is somewhere in the vicinity of Mount Pleasant, has been slowly sinking, and that's what we call a geologic basin. (greatlakesnow.org)
April 2021: Field work with lake sediment coring in small basin around the Mesolithic camp site at Sammakko in northernmost Sweden, aiming at paleoenvironmental reconstruction for the first millennium after deglaciation. (lu.se)

Findings from this project have implications for determining how sediment routing paths lead to floodplain alluvial architecture, and sediment flux to downstream reaches including coastal margins. (lsu.edu)
Ground conditions for the trenchless installation began in the same moderately weathered schist (160 ft), but after mining through a brief transition zone of cobbles and gravel near the river edge, alluvial river sediments of elastic silt and sandy silt were encountered throughout the remainder of the tunnel, outside of one rock pinnacle that was anticipated and encountered 620 ft into the drive. (tunnelingonline.com)
Triangular configuration of a section of coast open to the sea, created by the alluvial deposits at the mouth of a river, often, but not always, traversed by its branches. (bvsalud.org)

By extending geologic time to over four billion years radiometric dating initially appeared to provide adequate time for a dust-to-man evolutionary development. (grisda.org)

Over the last million years, unconsolidated Quaternary sediments have been deposited along the larger streams and rivers. (uky.edu)
The snakes die in water colder than 65 degrees, and they depend on the freshwater of rivers, streams, estuaries and rainfall for drinking water, a finding that Lillywhite and Sheehy published in 2014. (sciencedaily.com)
1995). A major river (Cross River) exists in the study area into which minor streams empty their loads. (projectclue.com)
There were several depositional environments along the river, including braided streams, point bars, and oxbow lakes, resulting in numerous rock types within the formation - conglomerates to sandstones to siltstones. (geologistwriter.com)

The geologic history of the Red River watershed spans over 400 million years, and starts with the deposition of sediments in marine and then river delta environments. (redrivergorge.com)
Traditional evolutionary geology maintains that the deposition of sediments to form major rock layers often takes long periods of time. (creation.com)

If we can understand the geologic factors that contribute to biodiversity, we can do a better job of conserving it," says Taylor Perron, the Cecil and Ida Green Professor of Earth, Atmospheric, and Planetary Sciences at MIT. (scitechdaily.com)
If we can understand the geologic factors that contribute to biodiversity, we can do a better job of conserving it," says Perron. (scitechdaily.com)
This naturally leads to the need to understand the geologic record and provides a powerful segue to more traditional geology 101 topics. (asu.edu)

The sandstone layer in which the pinnacles, pillars, arches, and knobs of Fantasy Canyon are formed consists of ancient river channel sediments. (utah.gov)
Gossans, laterites, bog iron ores, karst sediments, river channel sediments, and contact metamorphic limestones are favorable sites for iron oxide pigment deposits. (cdc.gov)

A procedure for the determination of very low polycyclic aromatic hydrocarbons (PAHs) concentrations in sediment samples has been developed by gas chromatography-quadrupole ion trap mass spectrometry (GC-QIT MS) after extraction with dichloromethane and purification by using silica gel cleanup. (who.int)

For more information, see the definitions of geologic terms and rock descriptions , a geologic map of Carlisle County , a summary of the geology of Kentucky , and a discussion of fossils and prehistoric life in Kentucky . (uky.edu)
These outstanding examples of cataclysmic flood geology, exceptional scenery, and places for scientific research are all part of the Ice Age Floods National Geologic Trail. (nps.gov)
To learn more about the geology of Sucia Island, there's a short paper, "Sucia Island, The Geologic Story" by George Mustoe of Western Washington University (April 2008) that's very informative. (geologistwriter.com)
Dr. Sean Cornell is professor in the Geography & Earth Science Department at Shippensburg University, specializing in physical geology topics, particularly sedimentary geology and geologic hazards, among other related topics. (forthunter.org)
The geologic map of the Castle Rock and Long Hollow quadrangles includes 1:24,000 scale mapping of both surficial and bedrock geology. (wisc.edu)
I am still very active within two of our research groups within Quaternary Sciences at the Department of Geology:(1) Glacial Processes, Sediments and Landforms and, (2) Reconstruction of Quaternary environments in Polar and mid-latitude regions - palaeoglaciology and climate history. (lu.se)
December 2021: Submitting first paper from the project 'The Siljan Lake District - Quaternary geology from deglaciation and into present time' to Earth Surface Processes and Landforms: "Deglaciation history and subsequent lake dynamics in the Siljan region, south-central Sweden, based on new LiDAR evidence and sediment records. (lu.se)

The area around Cascade Springs is underlain by coarse-grained glacial sediment deposited when glaciers covered high elevations of the Wasatch Range approximately 30,000 to 10,000 years ago. (utah.gov)
Rugged white mountain peaks are flanked by immense brown-and-white striped glaciers that snake down the slopes before melting into sediment-laden rivers that rush through green valleys then meander across the flat, pale green plain far below the mountain peaks. (agu.org)
I also wondered and worried about what the glaciers will look like in 10 years, in 20 years, in 50 years, in 100 years- blinks of an eye in geologic time but significant periods in human time. (agu.org)

On our continuing journey into the Great Unknown , rafting the Colorado River through the Grand Canyon, we had passed through three geological formations, the Kaibab, the Toroweap, and Coconino. (blogspot.com)
Geologic maps show the locations of these ancient formations. (nasa.gov)

The Tertiary Period began 70 million years ago, with deposits of marine and fresh- to brackish-water sediments. (uky.edu)
These deposits are a marked contrast to the underlying older hard rocks, because most of the Cretaceous and younger sediments remain unconsolidated and soft. (uky.edu)
These sediments were compacted into rocks and economically important oil and iron deposits result from diagenetic processes. (redrivergorge.com)
We approach this by comparing residual doses of sand and silt from the modern Mississippi River channel with estimated residual doses of sand isolated from Late Holocene Mississippi Delta mouth bar and overbank deposits. (copernicus.org)
Silt is shown to be generally sufficiently bleached in both the modern Mississippi River and associated paleo-deposits regardless of age, and silt may therefore provide a viable option for obtaining OSL chronologies in megadeltas. (copernicus.org)
Chamberlain, E. L. and Wallinga, J.: Seeking enlightenment of fluvial sediment pathways by optically stimulated luminescence signal bleaching of river sediments and deltaic deposits, Earth Surf. (copernicus.org)
This Bureau of Mines publication reviews the location, principal producers, and geologic occurrence of natural iron oxide pigment deposits. (cdc.gov)
The unstable, muck-like nature of the river deposits, mining beneath an active railroad, and the presence of reservoir obstructions and the rock pinnacle each offered unique challenges which were successfully navigated. (tunnelingonline.com)
As the project geologist, Maloney will be leading the research team and mapping the seafloor and different geologic deposits using various sonar techniques, Braje said. (thedailyaztec.com)

The Geologic processes are examined in three phases. (redrivergorge.com)
A project-oriented study of the processes and products of sediment formation, transport, deposition and lithification. (fivecolleges.edu)
There will be a full-day tour of the Angelo Reserve Eel River Critical Observatory that is a multi-disciplinary research collaborative that studies hydrologic processes from the tree tops to bedrock. (treesfoundation.org)
Consequently, rather than having a land surface exposed for enormous periods of time after an ocean retreated, the same Flood processes responsible for depositing the sedimentary layers were also capable of eroding significant thicknesses of both loose sediment and consolidated rock. (creation.com)
High-energy ocean processes are transporting and depositing sediment such that PGM-bearing materials are reworked and later masked by barren littoral drift. (cdc.gov)
Along the way I've been fortunate to work directly and indirectly on many interesting studies of national and international relevance related to groundwater availability and sustainability, and the role of groundwater in geologic processes. (usgs.gov)
This time coring lake sediment successions in Lake Siljan with aim to constrict processes and timing of lage subaqueous slumps detected from previous multi beam scanning of the lake floor. (lu.se)

The process began when sediments were first buried, but is ongoing today as groundwater flows through rock pores and continues to modify the rocks' internal structure. (redrivergorge.com)
Cold, slow-moving, small rivers of flat, marshy settings at high elevations or in areas of substantial cold groundwater inflow. (conservationgateway.org)

Modern sediments and depositional environments of the Massachusetts coast are examined and compared with ancient sedimentary rocks of the Connecticut River Valley and eastern New York. (fivecolleges.edu)

The lithified sediments formed strata that became the bedrock beneath the Pittsburgh area. (carnegiemnh.org)

Now there were ledges and cliffs of sandstone and other coarser sediments, indicative of a higher energy environment, such as the river channels of large floodplains and desert sand dunes. (blogspot.com)
In contrast to some previous investigations, we find that the bleaching of the OSL signal is at least as likely for finer sediment as for coarser sediment of the meandering Mississippi River and its delta. (copernicus.org)

The study area is underlain by two major lithologic units: Crystalline basement and Cretaceous sediments. (projectclue.com)
The Cretaceous sediments cover about 90% of the study area. (projectclue.com)

During the transition from winter to spring, glacial melt, snowmelt, and rainfall mobilize the sediment on the mountain slopes-a process that erodes the mountain peaks over geologic time. (nasa.gov)
The sands and other sediments deposited at this time are the materials that have since hardened to form the bedrock of the area. (redrivergorge.com)
Mostly, however, bridges cross geologically formed features such as rivers and the myriad forms of depressions carved into the landscape over time by flowing water. (carnegiemnh.org)
Thus, for the first time, a comprehensive 16 PAHs measurements campaign over the course of six months near the oil refineries along the Tigris River and its estuaries was investigated. (ljmu.ac.uk)
Here we explore the potential of luminescence methods for such purposes, focusing on bleaching of the optically stimulated luminescence (OSL) signal of quartz sediments in a large fluviodeltaic system across time and space. (copernicus.org)
What geologic time period ended with the largest mass extinction in Earth's history? (studystack.com)
Today's sea snakes -- about 60 species of fully marine sea snakes and eight species of semiaquatic sea kraits -- evolved in the warm, tropical conditions of the Coral Triangle at a time when the region was undergoing swift and dramatic physical, climatic and geologic change. (sciencedaily.com)
During the development of geological science in the early 19th century the span of geologic time was placed in the three million to 1.6 billion year range [11] . (grisda.org)
These early speculations were based on estimates of sedimentation rates and the total sediment presumed to have accumulated during each of the various divisions of geologic time. (grisda.org)
The 20th century development of radiometric dating produced a geologic time scale that appears to be firmly founded on sound physical science principles and precise measurements. (grisda.org)
In addition, the types and textures of sediments that compose these bluffs often reveal important clues that indicate changes in river flows through time as well as climate. (forthunter.org)
Marine sinking particles transport carbon from the surface and bury it in deep-sea sediments, where it can be sequestered on geologic time scales. (dtic.mil)
And geologic basins tend to fill with sediments, but they fill with different kinds of sediments, depending on the environment at the time. (greatlakesnow.org)

In Carlisle County, water is obtained from unconsolidated sediments of Tertiary and Quaternary age. (uky.edu)
In the Geologic Map of Wyoming, this band is identified as dune sand and loess deposited during the Quaternary Period -the most recent 2.6 million years of Earth's history. (nasa.gov)

According to research leader Carlos Alonso, his unit's work may help many states set and meet standards for the total maximum daily loads (TMDLs) of sediment their waterways can contain before being considered polluted. (usda.gov)
Of all pollutants requiring TMDLs, none is as prevalent--or as potentially damaging--as sediment, which causes about $16 billion annually in damage to North American waterways, according to Alonso. (usda.gov)
Relatively few tools presently exist to reconstruct sediment pathways within river and delta channel networks beyond instrumental (less than centennial or decadal) timescales, despite the high value of such information to human management of waterways. (copernicus.org)

The 16 PAHs concentrations in surface water and the sediments for the following oil refineries: Baiji, Kirkuk, Al-Siniyah, Qayyarah, Al-Kasak, Daura, South Refineries Company, and Maysan were examined. (ljmu.ac.uk)
The overall findings indicated that the 16 PAHs concentrations ranged from 567.8 to 3750.7 ng/L for water and 5619.2-12795.0 ng/g for sediment. (ljmu.ac.uk)
The majority of 16 PAHs measured in water and sediment samples of the Tigris River were derived from pyrogenic sources. (ljmu.ac.uk)

To be a nationally recognized leader in geologic and hydrogeologic sciences, building upon our rich scientific heritage and serving Iowans through research, education, and outreach. (issuu.com)

The results provide unique insights into the geologic history of eastern North America. (fivecolleges.edu)

Our work contributes to initiatives to use luminescence signals to fingerprint sediment pathways within river channel networks and their deltas and also helps inform luminescence dating approaches in fluviodeltaic environments. (copernicus.org)

The Red River Gorge is part of the Daniel Boone National Forest (DBNF) which contains an estimated 500 miles of trails through rugged terrain made of sandstone cliffs and exposed limestone rock faces. (redrivergorge.com)
Large rivers that flowed from the eroding ancestral Appalachian Highlands, hundreds of miles east of Pittsburgh, carried sand, silt, and mud to the coastal plain, forming sandstone, siltstone, and shale along the way 5 (fig. 2). (carnegiemnh.org)
In the sediment filled portions, the low plains are occasionally broken by flat -topped hills of sandstone ridges and igneous intrusive with highly ferroginized sandstones with gravels resulting from uplifts. (projectclue.com)

The Elizabeth River Monitoring Program 2001-2002: Association Between Mummichog Liver Histopathology and Sediment Chemical Contamination. (vims.edu)

The movement of rivers is also responsible for shaping the coastal plain's gradual downward slope toward sea level. (ncpedia.org)

This research is being conducted in collaboration with scientists from the USDA - National Sedimentation Laboratory in Oxford, MS. The study employs a range of techniques to provide high-resolution morphologic, geologic, and hydrodynamic data, including terrestrial LiDAR, sUAS (drones), multibeam echo sounding (MBES), ground penetrating radar (GPR), and acoustic Doppler current profilers (ADCP), on a series of meander bends along the Pearl River (Louisiana) and the Wabash River (Illinois). (lsu.edu)

A geologic formation or part of a formation (such as gravel, sand, or porous stone) that supplies water to wells or springs. (cdc.gov)

Water samples in South Refineries Company recorded the highest PAH concentrations while Baiji oil refinery registered the highest PAH concentrations in the sediment samples. (ljmu.ac.uk)
Based on sediment quality guidelines (SQGs), most sites showed a possible effect range with occasional biological effects of most of the PAH concentrations in all sediments' samples. (ljmu.ac.uk)

You can explore the geologic clues and special landscapes made by the Ice Age Floods at sites along the Ice Age Floods National Geologic Trail. (nps.gov)
Many of those ancient landscapes left behind clues in the form of rock layers-sandy or muddy sediments deposited by wind and water that later hardened into rock. (nasa.gov)

These small rivers of northern regions drain watersheds up to 200 sq.mi and have an average bankfull width of 72 feet. (conservationgateway.org)
These small rivers drain small watersheds of up to 200 sq.mi. (conservationgateway.org)

For example, improved knowledge of waterborne sediment pathways is a key component to delta restoration initiatives, such as river diversions aiming to mitigate land loss in deltas through delivery of sediment to the delta plain (e.g. (copernicus.org)
While the sea overtakes much of the delta plain of the Mississippi River, sediment from the Atchafalaya River is building two new deltas to the west. (nasa.gov)

In human history, one of the oldest existing bridges dating from antiquity is the single-arch stone bridge over the Meles River, built c. 850 BC in Izmir (formerly Smyrna) Turkey. (carnegiemnh.org)
Understanding the origins of the landscape features in Pittsburgh that make hundreds of bridges a necessity requires background knowledge of two long and widely spaced periods of Earth's geologic history. (carnegiemnh.org)
What would provide the most evidence about the geologic history of the Earth? (studystack.com)
North Carolina's rich geologic history and composition are as dramatic as its topography. (ncpedia.org)
North Carolina's long and often turbulent geologic history reveals the effects of both plate tectonics and weather . (ncpedia.org)
Fred Beyer, North Carolina, the Years before Man: A Geologic History (1991). (ncpedia.org)

The first is the accumulation of sediments in an ancient coastal river plain starting about 340 million years ago. (redrivergorge.com)
The coastal plain is North Carolina's largest geologic region, accounting for about 45 percent of the state. (ncpedia.org)

The team found that as rivers eroded through different rock types in the region, the changing landscape pushed a species of fish known as the greenfin darter into different tributaries of the river network. (scitechdaily.com)
The South Fork Eel River is considered one of five priority tributaries for flow enhancement in California and several planning projects are underway to improve flows in critical tributaries of the South Fork Eel. (treesfoundation.org)
The badlands are generally exposed in a series of east to west-trending valleys formed by the tributaries that feed to the south to the north-flowing Chaco River. (nmt.edu)
The Susquehanna River and its tributaries including the Juniata River, not only have a number of active "bluffs" along their modern river courses, but there are relict bluffs or terraces identifiable in the morphology of hillsides above them. (forthunter.org)

Later, in the Camas Prairie of northwestern Montana, he discovered giant ripple marks of sediment made by powerful currents flowing over the bottom of ancient Glacial Lake Missoula. (nps.gov)

The shale is often carbonaceous and pyritic which indicates that the sediments were deposited under a poorly oxygenated shallow water environment of restricted circulation, an indication of low energy environment (Petters et al. (projectclue.com)

A 90-day analysis of the sediment-impaired creek was requested by Mississippi officials to develop the federally mandated water-quality targets there. (usda.gov)
A wall of water hundreds of feet high thundered downstream at 65 miles per hour (105 km/hour) with ten times more water than all the world's rivers today. (nps.gov)
rivers, oceans, and natural hazards associated with water such as flooding, landsliding and tsunamis. (asu.edu)
The percentages of high molecular weight PAH (5-6 rings) in water and sediment samples were the highest, ranging from 49.41% to 81.67% and from 39.06% to 89.39% of total PAH for water and sediment, respectively. (ljmu.ac.uk)
Permanent cold water temperatures in these rivers means coldwater fish species, such as brook trout, likely represent over half of the fish community. (conservationgateway.org)
Additional variation in the biological community is associated with acidic, calcareous, and neutral geologic settings where the pH of the water will limit the distribution of certain macroinvertebrates, plants, and other aquatic biota. (conservationgateway.org)
Cool water temperatures in these rivers means the fish community will contain a higher proportion of cool and warm water species relative to coldwater species. (conservationgateway.org)
Additional variation in the biological community is expected in acidic, calcareous, and neutral geologic settings where the pH of the water will limit the distribution of certain macroinvertebrates, plants, and other aquatic biota. (conservationgateway.org)
The Wildcat Point Raw Water Supply Project, consisting of a new pump house, wet well intake shaft and conveyance pipeline on the banks of the Susquehanna River, draws water from the reservoir for the WPGF. (tunnelingonline.com)
The present day Mississippi River is comparatively tiny as it meanders through the large valley carved by the mighty glacial water flows. (red-wing.org)
The general aim of this study is to rely on the application of resistivity method to determine and model the direction of underground water as well as the hydrogeological pattern around Obubra area of Cross River State, Nigeria. (projectclue.com)
N. fowleri and thermophilic amebae were detected in recreational water and sediment samples throughout the facility. (cdc.gov)
Fecal indicators and antibiotic resistance genes exhibit diurnal trends in the Chattahoochee River: Implications for water quality monitoring. (cdc.gov)

The bright red color in such rocks (and the presence of sedimentary structures like ripplemarks) is strongly indicative of deposition in a river floodplain environment. (blogspot.com)
They are typically surrounded by floodplain forest, wetlands, or eroded sand or clay banks or fine sediment bars. (conservationgateway.org)

The oldest geologic formation exposed on the surface in Carlisle County is the Claiborne Formation of Tertiary age. (uky.edu)
We do not have a good geologic tool for dating arch formation, but we are sure that Wall Arch had stood nearly unchanged for hundreds, and probably thousands of years. (utah.gov)
When those rivers reached the lower slopes at the base of the mountain, they spread out and deposited the sediments on the flat plains in a fan-shaped formation. (nasa.gov)
But we ended our first day on the river in the midst of the Hermit Formation, a striking red-brown layer composed of siltstone and mudstone. (blogspot.com)
1987). In general, Southern Obubra lies within the Cross River plain and the clastic beds in the study area can be ascribed to the Ezillo Formation. (projectclue.com)
The Chuckanut Formation sediments were deposited by a meandering river 50 million years ago. (geologistwriter.com)

The bottom image is part of the Geologic Map of Wyoming, which was compiled from ground-based observations. (nasa.gov)

Geologic evidence that didn't fit with this idea led geologist J Harlen Bretz to hypothesize that the Channeled Scabland was formed by cataclysmic floods. (nps.gov)

The project, completed in Peach Bottom, Pennsylvania, involved building the intake pipeline into the bottom of the Conowingo Reservoir, which is formed by the Conowingo Dam along the Susquehanna River just south of the Pennsylvania-Maryland border. (tunnelingonline.com)

This incredible true story is recorded in rock and sediment. (nps.gov)
The second geological phase is the process of diagenesis and how the sediments were buried and turned into rock. (redrivergorge.com)
The region's hard rock meets the soft sediment of its eastern neighbor at an area known as the "fall line," or "fall zone," which is the site of many rapids and waterfalls. (ncpedia.org)
Like the sister project across the river, the Herrenknecht AVN-1200 with rock cutterwheel was recovered by Walker Diving , which excavated and supported a 16-ft x 48-ft recovery cofferdam 670 ft offshore. (tunnelingonline.com)
Such an eroded surface should be evidenced by gullies, stream and river canyons and valleys, and such like at the top of each major rock layer or layers. (creation.com)
Thus a new rock layer of perhaps an entirely different kind of sediment was then deposited. (creation.com)

Taylor Perron and Maya Stokes sample stream sediments. (scitechdaily.com)

These interior marsh areas would occasionally receive pulses of mineral sediment input due to storm tides. (lacoast.gov)
Beneath these impressive features lies an immense wealth of mineral resources deposited by regular geologic activity over hundreds of millions of years. (ncpedia.org)

In badlands-arid landscapes with sparse vegetation-some geologic features that are invisible or inaccessible from the ground can be seen from the sky. (nasa.gov)

Whenever the Mississippi River established a westerly course, large quantities of reworked riverine sediment were deposited along the gulf shore, resulting in southerly growth of the shoreline. (lacoast.gov)
Waters from Glacial Lake Agassiz, Glacial Lake Grantsburg, and Glacial Lake Duluth formed the deep valley of the Mississippi River Valley when large quantities of glacial lake melt waters rushed through the area. (red-wing.org)

Asu River Group is the basal and oldest recorded sediment in the study area. (projectclue.com)

Lexicon of Canadian Geologic Units. (wikipedia.org)

Flood control projects on the Mississippi and Atchafalaya rivers, and construction of jetties on the Mermentau River, Calcasieu Ship Channel, and at Sabine Pass, have altered long shore sediment transport and sediment availability. (lacoast.gov)
He and his research group study the morphodynamics of meandering rivers through process-based field investigations focusing on hydrodynamics, sediment transport, and planform evolution of rivers across the US. (lsu.edu)
These engineered outlets will siphon sediment from yet-to-be-determined depths and positions within the river channel, and so the availability and grain size of the utilized sediment will depend on its transport mode within the river (e.g. (copernicus.org)
The luminescence signals of sediment grains provide a unique and underexplored archive for reconstructing channel network dynamics and evolution, as they contain information regarding the transport histories of grains. (copernicus.org)

The significant spatial variations shown by most elements and minerals can commonly be attributed to geologic sources in underlying parent materials, but other spatial variations seem clearly related to additional factors such as climate, the age of soils, transported source material, and anthropogenic influences. (usgs.gov)
Join the Friends of Fort Hunter and Dr. Sean Cornell to explore the Fort Hunter/Susquehanna region to address some questions about how these features may have formed geologically and what they may indicate about changes in climate in PA during the recent geologic past. (forthunter.org)

These low-gradient rivers are often described as unconfined and have moderate to high sinuosity with broader valleys. (conservationgateway.org)

It thins out towards the east and occurs in the sub-surface throughout the Peace River Country. (wikipedia.org)
The Earth's near surface environment has been termed the "critical zone" as this is the zone that supports most life and because the Earth's surface is the dynamic interface where much of the geologic record is produced. (asu.edu)
This series of images shows the growth of surface mines around the Athabasca River from 1984 to the present. (nasa.gov)

When the Mississippi River shifted to an easterly course, the sediment supply decreased and erosive forces were greater than sediment deposition due to littoral drift. (lacoast.gov)
Mississippi River Valley: The River Warren, the largest of Minnesota's glacial rivers, was five miles across in some places. (red-wing.org)

Geologic evidence suggests that parts of North Carolina-including the oldest known rocks in the state (1.8 billion years old), located in the western Blue Ridge Mountains-were once at the boundaries of plates, although the creation of new crust in the Atlantic Ocean has moved the state's position to the middle of the North American plate. (ncpedia.org)
Field trip guidebook describes the evidence suggesting that the Wisconsin River once flowed from west to east. (wisc.edu)

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Chemicals and Drugs29

Analytical, Diagnostic and Therapeutic Techniques and Equipment4

Phenomena and Processes31

Disciplines and Occupations8

Anthropology, Education, Sociology and Social Phenomena3

Technology, Industry, Agriculture3

Information Science2

Health Care28

Geographicals8

Erosion15

BASIN14

Alluvial3

Extending geologic time1

Streams4

Deposition of sediments2

Understand the geologic3

Channel sediments2

Polycyclic Aromatic Hyd1

Geology7

Glaciers3

Formations2

Deposits9

Processes7

Groundwater2

Depositional environments1

Strata1

Coarser2

Cretaceous2

Time13

Quaternary2

Waterways3

PAHs3

Hydrogeologic1

North America1

Environments1

Sandstone3

Contamination1

Slope1

LiDAR1

Gravel1

Concentrations2

Clues2

Watersheds2

Deltas2

History6

Coastal2

Tributaries4

Ripple1

Poorly1

Water13

Floodplain2

Formation6

Wyoming1

Geologist1

Susquehanna River1

Rock6

Stream1

Mineral2

Landscapes1

Large quantities2

Area1

Units1

Transport4

Climate2

Valleys1

Surface3

Mississippi River2

Evidence2