Study geologic sediments. Medical search. Frequent questions

Marine sediment, or ocean sediment, or seafloor sediment, are deposits of insoluble particles that have accumulated on the seafloor. (wikipedia.org)
Except within a few kilometres of a mid-ocean ridge, where the volcanic rock is still relatively young, most parts of the seafloor are covered in sediment. (wikipedia.org)
Seafloor sediment can range in thickness from a few millimetres to several tens of kilometres. (wikipedia.org)
Near the surface seafloor sediment remains unconsolidated, but at depths of hundreds to thousands of metres the sediment becomes lithified (turned to rock). (wikipedia.org)
Seafloor sediments (and sedimentary rocks) can range in thickness from a few millimetres to several tens of kilometres. (wikipedia.org)
The various sources of seafloor sediment can be summarized as follows: Terrigenous sediment is derived from continental sources transported by rivers, wind, ocean currents, and glaciers. (wikipedia.org)
AOM converts the methane carbon to dissolved inorganic carbon (DIC) and reduces the amount of sulfate that diffuses down from the seafloor towards a sediment interval known as the sulfate-methane transition zone (SMTZ). (us-ocb.org)
The study is the latest to come from a 2016 International Ocean Discovery Program mission co-led by The University of Texas at Austin that collected nearly 3,000 feet of rock core from the crater buried under the seafloor. (sciencedaily.com)
We show that some main offshore faults within the boundary fault system have displacements of 3-5 km, and many faults are currently active because they deform the seafloor or very shallow sediment layers. (searchanddiscovery.com)
In the eastern part of the study area, this fault offsets the seafloor. (searchanddiscovery.com)

Predominant sediment types include Ms, Sm, and S. Sandier sediment is associated with Qfe/Qmn close to shore and close to outcrops of glacial drift where coarse sediment has been reworked and mixed with fine-grained sediment. (usgs.gov)
These surfaces provided a framework for a 3-D cellular partition, where descretizing the model allowed for mapping of hydrofacies assemblages that represented mappable heterogeneities of coarse- and fine-grained sediment in the Glasford deglacial unit. (uwaterloo.ca)
Fine-grained sediment assemblages have an average hydraulic conductivity value of 4.38E-8 m/s and thus may represent discontinuous aquitards impeding water flow. (uwaterloo.ca)
However, these fine-grained sediment assemblages cannot be considered homogeneous aquitards because of their textural variability and limited lateral continuity. (uwaterloo.ca)

My research centers around the history of Earth's climate, flora and fauna that is locked inside ocean, lake and terrestrial sediments. (columbia.edu)
As human activity increasingly affects our planet and the Anthropocene is recognizable as a stratigraphic epoch, Earth's geologic history has never been more relevant. (columbia.edu)
By analyzing rocks, fossils, and other clues, geoscientists are able to create timelines of events in the Earth's geologic history. (bls.gov)
Environmental geologists study how consequences of human activity, such as pollution and waste management, affect the quality of the Earth's air, soil, and water. (bls.gov)
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)
Burial of microplastics in lake and river sediment is just one way Corcoran has explored how plastics are becoming part of Earth's future rock record. (watercanada.net)
Studying Earth's past and present geologic wanderings may not only help resolve the controversy, but also improve our understanding of the planet's complex machinations. (nationalgeographic.com)
While deep geologic gyrations can have drastic impacts on Earth's surface, the planet's magnetic field remains largely unchanged by such events, since it is generated by the churn of molten iron and nickel in our planet's outer core, some 1,800 miles below the surface. (nationalgeographic.com)
By studying geomagnetic field variations at the Earth's surface we can learn more about the deep Earth where the field is generated. (lu.se)
Reconstructions of Earth's magnetic field prior to the record of historic observations are reliant on measurements on archaeologic (e.g. ceramics) and/or geologic (e.g. volcanic rocks, sediments) material that are able to record the ambient magnetic field at the time of their formation/manufacturing, the study of archaeo-/palaeomagnetism. (lu.se)

Sediments from the land are deposited on the continental margins by surface runoff, river discharge, and other processes. (wikipedia.org)
Based on the structural evolution of the northern Bonaparte Basin, data from the wells Loxton Shoals 1, Sunset 1 and Chuditch 1 in the Sahul Platform and Heron 1 in the Malita Graben depocentre, and the Seismic Line N11606 were used to clarify the geological conditions and reconstruct the hydrocarbon accumulation processes in the study area. (scirp.org)
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)
Geoscientists study the physical aspects of the Earth, such as its composition, structure, and processes, to learn about its past and present and to predict future events. (bls.gov)
Geologists study the materials, processes, and history of the Earth. (bls.gov)
This session aims to bring together research that contributes to new understanding of the dynamic processes, landforms, sediment cascades, and hazards of mountains. (copernicus.org)
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)
A project-oriented study of the processes and products of sediment formation, transport, deposition and lithification. (fivecolleges.edu)
Atekwana's research into tectonic plate processes in Botswana's East African Rift 'will broaden our understanding of the earliest stages of passive margin development, or continental separation - a missing link in the study of early rifting processes. (mst.edu)
In 1999, the USGS, in partnership with the South Carolina Sea Grant Consortium, began a study to investigate processes affecting shoreline change along the northern coast of South Carolina, focusing on the Grand Strand region. (usgs.gov)
By defining this geologic framework and identifying the transport pathways and sinks of sediment, geoscientists are developing conceptual models of the present-day physical processes shaping the South Carolina coast. (usgs.gov)
The principle of uniformitarianism ("the present is the key to the past") is helpful in that we can accurately measure the rates of geologic processes we see today and apply them to the geologic past. (cliffsnotes.com)
However, the common occurrence of numerous specimens for many species, and in a wide variety of oceanic environments, provides an excellent opportunity to study the processes of biologic evolution in the fossil record. (nhbs.com)

Florida's low topography and limited geologic exposures are reasons why we rely on borehole samples to provide critical subsurface geologic information about our state. (govdelivery.com)

Such is the case at the East African Rift zone where the ground is splitting apart, revealing layers of sediment dating to more than 14 million years ago. (mst.edu)
For example, we know layers of sediment build up on the ocean floor at the rate of about 1 millimeter per year. (cliffsnotes.com)

The goal of the USGS is to develop high-resolution (1:25,000) interpretive maps based on seabed sampling and previously-collected multibeam sonar data that show the bank's surficial geology and seabed sediment dynamics. (usgs.gov)
Each stratigraphic unit ( fig. 9 ) crops out at the sea floor in the study area ( fig. 16 ), and the areal distributions of the units are closely related to surficial sediment distributions ( fig. 17 ) and physiographic zone ( fig. 19 ) interpretations. (usgs.gov)
Surficial geologic units may not directly correspond with surficial sediment units because geologic units may be buried beneath surficial sediments too thin to be detected in the seismic data (less than about 0.5 m). (usgs.gov)
Polygons representing Z are included in the sediment-type map ( fig. 16 ) and were mapped as R. The surficial distribution of Z corresponds to Rocky Zones where the sediment texture is R ( fig. 19 ). (usgs.gov)
Interpretation of the geologic framework and seismic stratigraphy of Buzzards Bay was fundamental in developing a foundation for the surficial mapping. (usgs.gov)
This study aims at describing and comparing geomorphological and sedimentological features of surficial sediments and fossil reefs from three isolated carbonate platforms located in the SW Indian Ocean (Glorieuses, Juan de Nova and Europa). (ifremer.fr)

Rates of sediment accumulation are relatively slow throughout most of the ocean, in many cases taking thousands of years for any significant deposits to form. (wikipedia.org)
Prior studies have examined the rate of strain accumulation that is occurring along the Himalayan arc from satellite observations. (indiatimes.com)
Accumulation of Polychlorinated Organic Contaminants from Sediment by Three Benthic Marine Species. (epa.gov)
The study highlights that regions characterized by diffusive methane fluxes can contribute significantly to the oceanic inorganic carbon pool and sedimentary carbonate accumulation. (us-ocb.org)
Methane-derived authigenic carbonate precipitation is comparable to ~15% of carbonate accumulation on continental shelves and in pelagic sediments, respectively. (us-ocb.org)
Field observations, petrographic characterization and grain-size analyses are used to illustrate the spatial patterns of sediment accumulation on these platforms. (ifremer.fr)

The current spike in the region's weather far outstrips previously recorded warm periods in the medieval era, a study quoted in the Geology journal says. (upi.com)
The study was funded by the U.S. National Science Foundation and the Keck Geology Consortium. (upi.com)
But the resolution of our studies is at best on the order of 100 years, longer than a human lifetime," said Wesnousky, a professor of geology and seismology and director of the Center for Neotectonic Studies at the University of Nevada at Reno, US. (indiatimes.com)
In the latest study, the timing and size of most recent prehistoric earthquakes were defined from geology. (indiatimes.com)
She went on to study both archelogy and geology for her undergraduate degree, geo-archelogy for her master's and earthquakes for her Ph.D. Niemi specializes in geoarchaeology, sedimentology and active tectonics. (umkc.edu)
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 geological model developed in this study contributes to better understanding the complex subsurface geology in east-central Illinois. (uwaterloo.ca)
Now, a study published in the journal Geology suggests that it wasn't the climate that changed, but the geographic location of the landscape . (nationalgeographic.com)
Creation and development of bodies within solar systems, includes study of early planetary geology. (bvsalud.org)

He would then compare these data with historical records and use sediment cores to reconstruct the geologic history of the islands. (usgs.gov)
The core will be used to reconstruct the geologic history of the island. (usgs.gov)
The purpose of this study is to reconstruct paleoenvironments on the Ross Sea and confirm modeling studies that show warming waters in the Southern Ocean led to the loss of Antarctic ice in the past. (umass.edu)

We need both ice core and lake sediment records," glaciologist Elisabeth Isaksson said. (upi.com)
Abundances were as high as 4,270 microplastics particles per kilogram of dry weight sediment in lake sediment, and up to 2,444 microplastic particles per kilogram in river sediment. (watercanada.net)

In a joint initiative with the Provincetown Center for Coastal Studies, the Cape Cod National Seashore has undertaken a monitoring program examining the erosion and retreat of the coastal bluff. (nps.gov)
This project has led to insight into erosion rates and sediment cycling on the beaches of the ocean coast. (nps.gov)
Using quantitative field methods to study shoreline erosion of a barrier beach. (carleton.edu)
The high potential energy and the sensitivity to climate change condition mountain landscapes for rapid change, in the form of erosion, sediment remobilisation, or landcover change. (copernicus.org)
Results of this study confirm the high degree of heterogeneity in the Glasford deglacial unit that includes features of glacial erosion, and these findings question, at least locally, the integrity of the underlying Vandalia Member till as a regional aquitard unit. (uwaterloo.ca)

However, a significant portion of subsurface methane is consumed within shallow sediments via microbial driven anaerobic oxidation of methane (AOM). (us-ocb.org)
They report an annual average of 8.7 Tmol (1 Tmol = 10 12 moles) of DIC entering the diffusive methane-charged shallow marine sediments due to sulfate reduction coupled with AOM and organic matter degradation, as well as DIC input from depth (Figure 1). (us-ocb.org)
High resolution seismic data show that this fault deforms shallow sediment making up the Hueneme fan, so this fault probably has been active during the Holocene. (searchanddiscovery.com)

Ten sub-surface sediment samples were collected from the eastern part of the basin, and quartz OSL dating using single-aliquot regenerative-dose protocol was conducted for. (lu.se)
Elsewhere in the basin, bedrock is buried by Quaternary sediment. (usgs.gov)
When associated with Nearshore Basin zones, Qdf includes sediment-type Sm. (usgs.gov)
Discussion of current research or advanced topics in landscape evolution, surface hydrology, mechanics of sediment transport, basin analysis, or experimental geomorphology. (asu.edu)
The sediment trapped in the basin offers clues to humanity's past, she says. (mst.edu)

The result of this multi-stage mineralization is fossil wood with striking beauty and a complex geologic origin. (researchgate.net)
Over the last year, Christ and an international team of scientists--led by Paul Bierman at UVM, Joerg Schaefer at Columbia University and Dorthe Dahl-Jensen at the University of Copenhagen--have studied these one-of-a-kind fossil plants and sediment from the bottom of Greenland. (eurekalert.org)

Pelagic carbonate sediment is derived from organisms (e.g., foraminifera) living in the ocean water (at various depths, but mostly near surface) that make their shells (a.k.a. tests) out of carbonate minerals such as calcite. (wikipedia.org)
Pelagic silica sediment is derived from marine organisms (e.g., diatoms and radiolaria) that make their tests out of silica (microcrystalline quartz). (wikipedia.org)

Death by asteroid rather than by a series of volcanic eruptions or some other global calamity has been the leading hypothesis since the 1980s, when scientists found asteroid dust in the geologic layer that marks the extinction of the dinosaurs. (sciencedaily.com)
In an active continental rift zone, two plates are separating causing geologic activity such as volcanic eruptions, says Atekwana. (mst.edu)
But during passive margin development the plates have already separated and the volcanic eruptions have ceased, which creates the unique opportunity to study the sediment. (mst.edu)

Although the respective roles of tectonics, sediment supply and sea-level changes in the stratigraphical architecture of these systems are relatively well constrained, the details of the nature and controls on the variability of sedimentological patterns between and within individual geomorphologic units on platforms have been barely investigated. (ifremer.fr)

The sampler was equipped with a video camera and a CTD and was deployed in drift mode to collect sediment for grain-size analysis, video imagery of the seabed, and measurements of water column properties. (usgs.gov)
Dan Ciarletta (right) working alongside Julie Bernier (left) to collect a sediment core on Mullet Key in Pinellas County, Florida. (usgs.gov)
In the first part of House's study, the rover used its on-board drill to collect rock and soil samples at 24 different sites around Gale Crater. (time.com)
As sediments collect and solidify or lava cools to stone, these minerals align themselves with the global magnetic field like compass needles, recording a snapshot of a region's location on our planet at a given period in the past. (nationalgeographic.com)

Recent geologic research on the sandstone strata of Grand Canyon appears to be confirming the creationist perspective. (equip.org)
Previous work along the U.S. Atlantic coast shows that the structure and composition of older geologic strata located seaward of the coast heavily influences the coastal behavior of areas with limited sediment supply, such as the Grand Strand. (usgs.gov)

New Delhi: The entire Himalayan arc is poised to produce a sequence of great earthquakes , and the next big quake -- of the magnitude of 8 or above -- may occur during our lifetimes, according to a study reviewing geological, historical, and geophysical data. (indiatimes.com)
S pecifically, Neimi's scientific interests include studying a ctive faults, earthquake recurrence in the geologic and archaeological records, reconstructions of ancient environments, analyses of high-resolution geophysical data and the study of recent hurricane and tsunami sediment deposits. (umkc.edu)

The new research, led by geoscientist Christopher House of Pennsylvania State University, was based on work conducted by NASA's Curiosity rover , which has spent the last nine and a half years in Mars's Gale Crater, a one-time lake, studying its rocks and surface sediments in search of clues to the planet's geologic-and biologic-history. (time.com)

In fact, clay settles everywhere in the oceans, but in areas where silica- and carbonate-producing organisms are prolific, they produce enough silica or carbonate sediment to dominate over clay. (wikipedia.org)
Isolated carbonate platforms occur throughout the geologic record, from Archean to present. (ifremer.fr)

The major features of the biogeochemical cycle of barium include wet and dry deposition to land and surface water, leaching from geological formations to groundwater, adsorption to soil and sediment particulates, and biomagnification in terrestrial and aquatic food chains. (cdc.gov)

These sediments tend to be relatively coarse, typically containing sand and silt, but in some cases even pebbles and cobbles. (wikipedia.org)
Major heterogeneities have been recognized in these features and mapped at regional scale represented by fine- and coarse-grained sediment assemblages that comprise 46% and 54% respectively of the Glasford deglacial unit volume. (uwaterloo.ca)
Laterally continuous coarse-grained sediment assemblages are primarily located in the Champaign valley and potentially represent local aquifers of limited but usefully productivity for east-central Illinois. (uwaterloo.ca)

Records of geomagnetic field variations can also be used to relatively date geologic and archaeological archives and even to infer past changes in the Sun's magnetic field ("solar activity"), exploiting their combined influence on atmospheric production of cosmogenic radionuclides. (lu.se)

Researchers produced the 1,800 year climate record by analyzing levels of unsaturated fats in algae buried in the sediments of Kongressvatnet Lake, in western Svalbard. (upi.com)
But lake sediments, with a record of summertime temperatures, can tell scientists how climate varied the rest of the year and in places where ice sheets are absent. (upi.com)
In this activity you will work as a paleontologist - a scientist who studies fossils to understand ancient landscapes, climate, and life on Earth - to find and identify fossils. (earthsciweek.org)
The new study provides the strongest evidence yet that Greenland is more fragile and sensitive to climate change than previously understood--and at grave risk of irreversibly melting off. (eurekalert.org)
The sediment contains not only evidence of past plants and animals, but is also an indicator of past climate. (mst.edu)

Students profile a beach and mechanically process sediment to document the changes along a shoreline. (carleton.edu)

This research focuses on quartz optically stimulated luminescence (OSL) dating of the upper siliciclastic sediments to help bridge the lacuna that arose from previous relative geologic dating. (lu.se)

For his Mendenhall postdoctoral research at the USGS St. Petersburg Coastal and Marine Science Center in Pinellas County, Florida, Dan uses a combination of field and modeling approaches to study barrier island sensitivity to drivers such as sediment flux, sea-level rise, and storms. (usgs.gov)
Drawing on conceptual models of barrier landscape evolution and measured rates of change in barriers located around the world, Dan produced a numerical model to simulate coastal change driven by sediment fluxes and rate of sea-level rise. (usgs.gov)
These pathways must be included in coastal and geologic carbon models. (us-ocb.org)

These are the fundamental questions my research seeks to answer through studies of the elemental, molecular and isotopic composition of sediment archives. (columbia.edu)
The concentration and composition of these "asteroid elements" resembled measurements taken from the geologic layer at 52 sites around the world. (sciencedaily.com)

Dr. Flemings' research couples observation with theoretical analysis to study crustal fluid flow at human and geologic timescales. (utexas.edu)

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)
Using the Great Lakes as a laboratory, sedimentary petrologist Patricia Corcoran and her students at Western University in London, Ontario are studying the behaviour of microplastics as a geologic phenomenon. (watercanada.net)

The methodology to study the Glasford deglacial unit relies on the detailed analysis of 7 continuous cores and interpretations of 4 geophysical profiles, which provide key stratigraphic control to estimate unit geometry and establish the vertical succession of facies assemblages in the unit. (uwaterloo.ca)

By the time the cores of sediment were raised to the surface, the tubes contained up to 100 million years of Earth history. (guildofscientifictroubadours.com)

The soil samples are tested in a geotechnical laboratory to determine the strength and stiffness properties of the seabed sediments. (haleyaldrich.com)

In addition, regional geologic structures (∼2.8 to ∼24.5 km) occur at the western flank of the study area. (degruyter.com)
As fossils radiolarians are also fairly common, and often occur in sediments where other types of fossils are absent. (nhbs.com)

Geoscientists study the physical aspects of the Earth. (bls.gov)

As sediments are turned to rock, compression can tweak the magnetic signature and impact their inferred planetary position. (nationalgeographic.com)
To look further back in time we rely on indirect observations of the magnetic field recorded in geologic and archaeologic material, the study of palaeomagnetism. (lu.se)

Through the application of OSL, the age framework of the uppermost part of sediments in the study area was established. (lu.se)

Turbidity currents can transport this sediment down the continental slope to the deep ocean floor. (wikipedia.org)

Location and analyses of sediment samples collected on Stellwagen Bank off Boston, Massachusetts from November 5, 2013 to April 30, 2019 on U.S. Geological Survey field activities. (usgs.gov)
The analyses of organic matter showed that the source rocks in the study area and Malita Graben were gas prone with kerogen types II2 & III and III predominantly. (scirp.org)

To address this challenge, the Ibadan Hydrogeophysics Research Site was established in 2019 as the first field-scale hydrogeological research laboratory in Nigeria to advance understanding of the geologic, hydraulic, and hydrogeochemical variabilities within crystalline basement aquifers. (mdpi.com)

however, it's important to enlist geotechnical engineers who can dive deeper into the data and characterize seabed sediments through offshore site investigations. (haleyaldrich.com)
To explore these questions, and shed light on implications such as which animals may be at risk from microplastics, Corcoran's team has analyzed offshore and nearshore sediment samples from Lakes Huron, Ontario, Erie, and St. Clair, and their tributaries. (watercanada.net)

Skeletal components including coral, green algae, and benthic foraminifera fragments prevail in these sediments. (ifremer.fr)

A total of 964 stream sediments and 42 rock samples were analyzed. (cdc.gov)
These deposits are generally associated with Sm sediment type, although Sg, sand with a gravel lag can be present where Qdl has been eroded, which is confirmed from sediment samples and bottom photographs in the depression near Quicks Hole. (usgs.gov)
And Curiosity found plenty of it: Nearly half of the samples the rover studied had significantly higher levels of carbon-12 than scientists typically detect in Martian meteorites or in the Martian atmosphere. (time.com)
N. fowleri and thermophilic amebae were detected in recreational water and sediment samples throughout the facility. (cdc.gov)

Relative time concerns the sequence of geologic events, and absolute age measurements concern the actual age of a rock or mineral. (cliffsnotes.com)

Thus, this study sheds light on the understanding past coast dynamics in the region. (lu.se)
A lack of proven methods for defining how much sediment constitutes pollution has contributed to past delays, according to Alonso. (usda.gov)
The research is a comprehensive review of paleoseismological studies of past Himalayan earthquakes and a forecast of the future events based on the findings," said Mitra, a professor in the department of Earth sciences at the Indian Institute of Science Education and Research ( IISER ) Kolkata. (indiatimes.com)
The methodology directly applies geologic principles to defining the past size and timing of earthquakes recorded by sediments broken and deformed by earthquake offsets at sites along the length of the Himalayan Frontal Thrust, Wesnousky said. (indiatimes.com)
These findings highlight the high potential of these platforms to study past sea-level changes and the related reef response, which remain poorly documented in the SW Indian Ocean. (ifremer.fr)
That suggested that the ice was gone in the recent geologic past--and that a vegetated landscape, perhaps a boreal forest, stood where a mile-deep ice sheet as big as Alaska stands today. (eurekalert.org)
This has made them very valuable for certain types of geologic research, particularly estimating the geologic age of the sediments containing them, and as guides to past oceanic water conditions. (nhbs.com)

I am an organic and isotope geochemist who studies the history of our Earth through the rocks and sediments that accumulate on land, in lakes and at the bottom of the ocean. (columbia.edu)
I am particularly focused on the geologic history of the water cycle and the application of novel isotopic approaches to understanding this history. (columbia.edu)
Mapping the history of natural hazards in a region, combined with an understanding of related geologic forces can help forecast the locations and likelihoods of future events. (carleton.edu)
The results provide unique insights into the geologic history of eastern North America. (fivecolleges.edu)
International Ocean Discovery Program (IODP) Expedition 374 sailed to the Ross Sea in 2018 to study the history of the WAIS over the last 20 million years. (umass.edu)
Previous geologic drilling projects into Ross Sea sediments that record the history of the WAIS (DSDP Leg 28, RISP, MSSTS, Cape Roberts Drilling Project, ANDRILL), as well as modeling studies, show considerable variability of ice-sheet extent during the Neogene and Quaternary including ice sheet collapse during times of extreme warmth. (umass.edu)
Full chapters on the history of study, and molecular biology, are the first ever in book form. (nhbs.com)

By studying the barrier island system holistically, from the back barrier to the waterline and even out to the continental shelf, Dan planned to incorporate the data into numerical models of barrier island evolution to identify the interactions and drivers of barrier island evolution and predict future change. (usgs.gov)

We propose that at the west end of the Santa Monica Mountains, where the Oxnard plain begins, a north-south alignment of geologic structures, topographic features and a gravity anomaly indicates a structural zone that strikes north, transversely to the mountains. (searchanddiscovery.com)

When Agricultural Research Service scientists were called upon in 2002 to study sediment's effects on a Mississippi waterway, they took things a step further and tested techniques aimed at helping states comply with a key provision of the federal Clean Water Act. (usda.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)
Much of this research uses the organic components of sediments and their molecular and isotopic character. (columbia.edu)
In this Geologic Time Resorts activity students do in-depth research on a given geologic time period of the Phanerozoic Eon and create brochures 'selling' their time period as a resort destination. (carleton.edu)
Seismologist Supriyo Mitra noted that the research matches previous studies. (indiatimes.com)
Thus, the purpose of this research is to improve knowledge of the heterogeneous character of the Glasford deglacial sediments and their three-dimensional (3-D) hydrostratigraphic architecture. (uwaterloo.ca)
David Lazarus has studied the palaeobiology and earth science applications of Cenozoic radiolaria for more than 40 years, formerly holding research positions at Columbia University/Lamont Earth Observatory, the Woods Hole Oceanographic Institution, and the Eidgenoessische Technische Hochschule Zurich. (nhbs.com)
He leads an industry-supported research consortium (UT GeoFluids) that combines geomechanical modeling, experimental analysis, and field study to study pore pressure and fluid flow in basins. (utexas.edu)

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)

These field activity data releases, publications, and maps are part of the combined effort by the U.S. Geological Survey and NOAA's Stellwagen Bank National Marine Sanctuary to map the geologic substrates of Stellwagen Bank and to study the ecology of fish and invertebrate species that inhabit the bank's sandy substrates off Boston, Massachusetts. (usgs.gov)
Below are data releases associated with the Stellwagen Bank National Marine Sanctuary Geologic Mapping project. (usgs.gov)
These data are part of the effort to map geologic substrates of the Stellwagen Bank National Marine Sanctuary (SBNMS) region off Boston, Massachusetts. (usgs.gov)
however, they are outside of the area of the geologic map and are not included in the geospatial data. (usgs.gov)
Instrumentation, Recording, and Processing of Meteorological Data Near Portage, Wisconsin: Wisconsin Power Plant Impact Study. (epa.gov)
In addition, the majority of palaeomagnetic data come from sediment records that are often naturally smoothed in time, which make modelling and geophysical inferences from the models more challenging. (lu.se)

We welcome all types of studies that aim to quantify the rates of active plate deformation and the dates of tectonic events, regardless of their spatio-temporal scale or methodology. (copernicus.org)

These observations taken together are telling us that sufficient strain has accumulated along virtually the entire arc to again produce great earthquakes as we observe in the geologic record," Wesnousky explained. (indiatimes.com)
Subsequent studies started to fill in the gaps in the record, and increasingly it seemed that the entire world was in on the Jurassic mega-shift, with evidence found in modern-day Africa , North America , South America, and the Middle East . (nationalgeographic.com)

Terrigenous sediments predominate near the continents and within inland seas and large lakes. (wikipedia.org)
What are the main sources of microplastics to Great Lakes sediment? (watercanada.net)

Summers on the largely glacial land mass about 400 miles north of mainland Europe are warmer than at any other time in the last 1,800 years, including during medieval times when parts of the northern hemisphere were as hot as, or hotter, than today, says the study. (upi.com)

Benthic microplastics-those incorporated into lake bottom sediments-were also more abundant near high population areas, which are also associated with plastics industry locations. (watercanada.net)

Sediment transported from the land accumulates the fastest, on the order of one metre or more per thousand years for coarser particles. (wikipedia.org)

The new study seals the deal, researchers said, by finding asteroid dust with a matching chemical fingerprint within that crater at the precise geological location that marks the time of the extinction. (sciencedaily.com)
A 3-D geological model was created using gOcad®, a geomodelling software, across a 2642 square kilometer study area and the deglacial unit having a subsurface volume domain of 5.70E+9 cubic meters. (uwaterloo.ca)
The geologic time scale is constructed through scientific methods and calculations as well as from the interrelationships of geological features as observed in the field. (cliffsnotes.com)
Geologic studies in Alaska by the U.S. Geological Survey, 1991: U.S. Geological Survey Bulletin 2041, p. 60-69. (alaska.gov)

An embryonic rift valley in Botswana, the southwestern extension of the East African Rift System, where some of the earliest hominids have been discovered, may also hold answers to continental breakup, according to a UMR geologist who is studying how the rift has formed. (mst.edu)

The study area is divided into four geologic terranes based on a review of the available literature. (cdc.gov)
Lineaments of the study area were extracted from the EHGA map. (degruyter.com)
and 2) an extensive tabular unit overlying the valley fill and extending across the entire study area. (uwaterloo.ca)

How do sea-level rise and sediment flux affect island structure and vulnerability to change? (usgs.gov)
A geologic change might have plunged lush landscapes into arid zones, killing off an array of creatures-and it might happen again one day. (nationalgeographic.com)

In the crater, the sediment layer deposited in the days to years after the strike is so thick that scientists were able to precisely date the dust to a mere two decades after impact. (sciencedaily.com)
The study of rift basins could help scientists better understand the initial stages of continental breakup, she says. (mst.edu)

The sediments provide habitat for a multitude of marine life, particularly of marine microorganisms. (wikipedia.org)

Near the surface, the sea-floor sediments remain unconsolidated, but at depths of hundreds to thousands of metres (depending on the type of sediment and other factors) the sediment becomes lithified. (wikipedia.org)
Now, a new study, announced by NASA and published on Jan. 18 in the Proceedings of the National Academy of Sciences , suggests that some of those lingering surface markers of ancient life may have been found-lying in plain sight, in fact. (time.com)

Four geologic periods had ground by, but these microbes, protected from radiation and cosmic rays by a thick coat of ocean and sediment, quietly persisted. (guildofscientifictroubadours.com)

Organisms11

Chemicals and Drugs23

Analytical, Diagnostic and Therapeutic Techniques and Equipment2

Phenomena and Processes21

Disciplines and Occupations5

Anthropology, Education, Sociology and Social Phenomena1

Information Science2

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Seafloor10

Fine-grained sediment4

Earth's10

Processes13

Subsurface geologic1

Layers of sediment2

Surficial6

Accumulation6

Geology9

Reconstruct3

Lake sediment2

Erosion5

Shallow3

Basin5

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Volcanic3

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Collect4

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Terrestrial1

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