Marine geologic sediments. Medical search. Frequent questions

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)
Mr. Phelps explains, "Hardgrounds are surfaces in the geologic record that lithified on the sea floor and then were bored into and encrusted by marine invertebrates, followed by the deposition of more sediments. (pandasthumb.org)
After transport and laying down, or deposition, of sediments by wind , water, or ice , compaction occurs due to the weight of overlying sediments that accumulate later. (jrank.org)
For example, any particular sediment or sedimentary rock frequently has characteristics revealing information concerning the source rock and its proximity, and the processes of weathering, erosion, transportation, and deposition of the sediment. (biblicaltraining.org)
Though far less common than algal limestone, standing tree trunks are a clear indicator of at least tens of years having passed during the deposition of the sediments in certain strata. (gci.org)
At that time, most scientists believed these geologic features were formed by gradual erosion and deposition following the notion of uniformitarianism, which ruled out sudden changes in the landscape by catastrophic events. (creation.com)
The primary input of organic matter to almost all marine sediments comes from deposition at the sediment surface. (yale.edu)

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)
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)
Students in the Jackson School's Marine Geology & Geophysics (MG&G) course work with an array of data. (utexas.edu)
The primary objectives of this program were to collect marine geophysical data to develop a suite of seafloor maps to better define the extent of oyster habitats, the overall seafloor geology of the bay and provide updated information for management of this resource. (noaa.gov)
These data allow a detailed mapping of the surficial geology of the lake's floor and the distribution and thickness of sediment that has accumulated in the lake since the completion of Hoover Dam. (usgs.gov)

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)

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)
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)

In Carlisle County, water is obtained from unconsolidated sediments of Tertiary and Quaternary age. (uky.edu)
Over the last million years, unconsolidated Quaternary sediments have been deposited along the larger streams and rivers. (uky.edu)

Methane-derived authigenic carbonate precipitation is comparable to ~15% of carbonate accumulation on continental shelves and in pelagic sediments, respectively. (us-ocb.org)
Accumulation of Polychlorinated Organic Contaminants from Sediment by Three Benthic Marine Species. (epa.gov)
The first is the accumulation of sediments in an ancient coastal river plain starting about 340 million years ago. (redrivergorge.com)
These factors are varied and diverse as represented by the present day accumulation of sediment. (biblicaltraining.org)
Richard Waitt: "It suggested that periodically during the accumulation of this sediment that there had to be dry land. (creation.com)
Results indicate that the accumulation of post-impoundment sediment is primarily restricted to former river and stream beds while alluvial deposits and rock outcrops are still exposed on the lake floor away from the former river beds. (usgs.gov)

This report describes mineral investigations conducted by the Bureau of Mines on geologic and depositional processes contributing to potential coastal and offshore platinum-group metal (PGM) placer deposits around the Goodnews Bay Mining District. (cdc.gov)
Concentrations of uranium (U), thorium (Th), and potassium (K) in geological materials provide insight into many important lithological characteristics and geologic processes. (darkenergybiosphere.org)
In marine sediment, they can aid in identifying clay compositions, depositional environments, and diagenetic processes. (darkenergybiosphere.org)
Since the geologic layers are not lithified, they erode easily under marine processes like wave action or tidal currents. (stockton.edu)
The Geologic processes are examined in three phases. (redrivergorge.com)
These sediments were compacted into rocks and economically important oil and iron deposits result from diagenetic processes. (redrivergorge.com)
During the Precambrian, contrary to previous conjecture, a major proportion of carbonate was buried in the deep sea through abiotic processes, rather than in the shallow marine environment like reefs that dominate most of the Phanerozoic marine carbonate factory. (yalescientific.org)
Geologic processes, such as weathering, erosion, water drainage, and the subduction of continental plates, all play a role in the cycling of elements on Earth. (uwf.edu)

Samples of gravel and sand separated from sediment samples. (utexas.edu)
The New Jersey upland along the coast is composed of gravel, sand and silt deposits whose geological origins are derived from both marine and non-marine sedimentary episodes. (stockton.edu)
Subsurface deposits of pre-Wisconsin age consist of buff to reddish-brown sand and gravel locally incised into Miocene sediments (e.g. (md.gov)
A geologic formation or part of a formation (such as gravel, sand, or porous stone) that supplies water to wells or springs. (cdc.gov)

Grand Canyon sandstone, limestone, and shale strata are recognized as containing fossilized marine organisms that died violently during rapid burial when ocean water was over the continent. (equip.org)
Recent geologic research on the sandstone strata of Grand Canyon appears to be confirming the creationist perspective. (equip.org)
The geologic time scale is based principally on the relative ages of sequences of sedimentary strata . (britannica.com)
Are Geologic Strata the Result of the Biblical Flood? (gci.org)
This latter situation is what we find for most strata in the geologic record. (gci.org)
Structures similar to these are found in many strata throughout the geologic record, from very young strata to some of the oldest in which abundant remnants of life are found. (gci.org)
When these telltale structures are found interbedded with marine or lake strata, it is clear that the strata were deposited under normal life conditions. (gci.org)
GeoView employs three methods for studying the geologic strata and objects buried beneath the seafloor. (geoviewinc.com)
It is useful for mapping sediment thickness, karst surveys, conducting scour studies, mapping shallow geologic strata and mapping buried utilities and other submerged structures. (geoviewinc.com)
Marine seismic refraction is used to map geologic strata and to obtain compressional wave velocities of the sediment and rock. (geoviewinc.com)
Seismic reflection data generally has a greater depth of penetration and resolution and is therefore useful in mapping geologic strata and identifying fault locations. (geoviewinc.com)

The Futaba Group is a Late Cretaceous geologic group in Japan. (wikipedia.org)
Fluvial-Shallow Marine Depositional Systems of the Futaba Group (Upper Cretaceous). (wikipedia.org)
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)
The non-marine Cretaceous sediments of northern Delaware older than the Magothy formation cannot be divided accurately into formations or mappable geologic units because their lithologic characteristics are very similar. (udel.edu)
Many Cretaceous rocks in southern New Mexico, however, are non-marine and contain paleosols and dinosaur fossils. (nmsu.edu)

It consists of both fluvial and shallow marine sediments. (wikipedia.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)

These sites can be characterized by artificial fill overlying marine sediments overlying glacial till and bedrock, where the depth to bedrock ranges from 20 to 80 m. (usgs.gov)

The initial surficial geologic interpretations have been translated by the Office for Coastal Management into the Florida System for Classifying Habitats in Estuarine and Marine Environments (SCHEME). (noaa.gov)

These results indicate that authigenic carbonate precipitation in these sediments is not centered around the sulfate-methane transition zone (SMTZ), as is seen in many other sedimentary environments but occurs at shallower depths in the sediments and over a relatively broad depth range. (yale.edu)

By washing the muddy sediments over a series of sieves, along with working out how much silt versus clay was left suspended in the water, the students determined the size of the materials that made up a sample of the seafloor. (utexas.edu)
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 interpretation is based on the sidescan sonar imagery, the bathymetry, available sediment sample information, and seafloor observations. (noaa.gov)
Here, we use a global diagenetic model to highlight orders-of-magnitude differences in sediment ages at fixed sub-seafloor depths (and vice-versa), and vastly different BE's depending on sediment depth or age horizons used to calculate BE. (darkenergybiosphere.org)

Here we show that, in this region, microbial cells and aerobic respiration persist through the entire sediment sequence to depths of at least 75 metres below sea floor. (darkenergybiosphere.org)
Extrapolating this relationship, we suggest that oxygen and aerobic communities may occur throughout the entire sediment sequence in 15-44% of the Pacific and 9-37% of the global sea floor. (darkenergybiosphere.org)
These model-determined rates of oSR and methanogenesis also result in a rate of POC loss that declines near-continuously in a logarithmic fashion over the entire sediment column studied. (yale.edu)

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)

Organisms preserved as fossils that lived over a relatively short span of geologic time and that were geographically widespread are particularly useful for stratigraphic correlation. (britannica.com)
These fossils are indexes of relative geologic age and may be termed index fossils . (britannica.com)
For example, many limestones are composed of abundant marine fossils so these limestones are of organic rather than chemical origin. (jrank.org)
Analysis of the surrounding sediments showed they had been part of a tidal flat environment, and the fossils-a broad mix of both adult and juveniles of different species-were deposited in four distinct layers over the course of about 16,000 years. (smithsonianmag.com)
There was no geologic evidence of a powerful tsunami, such as sand deposits where they shouldn't be , and the fossils were in excellent condition, relatively intact. (smithsonianmag.com)
As fossils radiolarians are also fairly common, and often occur in sediments where other types of fossils are absent. (nhbs.com)

These sediments are the source of all modern New Jersey beaches by erosion or by the reworking of other deposits formed from these older sediments prior to the present sea level rise. (stockton.edu)
The ancient coastal plain sediments are directly exposed to wave erosion from Long Branch, south to Bay Head. (stockton.edu)

We find that trends in cell abundance, POC storage and degradation, and microbial power utilization are mainly structured by depositional setting and redox conditions, rather than sediment depth and age. (darkenergybiosphere.org)
Overall, we demonstrate broad global-scale connections between the depositional setting and redox conditions of global sediment, and the amounts of organic carbon and activity of deep biosphere microorganisms. (darkenergybiosphere.org)

Subduction of the sediment and basalt from these regions is a source of oxidized material to the mantle. (darkenergybiosphere.org)
Geologic subduction pushed the sediment upward by about 130 feet, lifting the mud flats and transforming them into dry land in what's now known as Chile's Atacama Desert . (smithsonianmag.com)

We identify a relationship of O 2 penetration depth to sedimentation rate and sediment thickness. (darkenergybiosphere.org)

Based on the Redfield stoichiometry of dissolved O 2 and nitrate, we suggest that net aerobic respiration in these sediments is coupled to oxidation of marine organic matter. (darkenergybiosphere.org)
The marine sediments generally consist of organic silts, sand, and Boston Blue Clay. (usgs.gov)
Organic sedimentary rocks form from organically derived sediments. (jrank.org)
These organic sediments come from either animals or plants and usually consist of body parts. (jrank.org)
Quantifying the organic carbon (OC) sink in marine sediments is crucial for assessing how the marine carbon cycle regulates Earth's climate. (darkenergybiosphere.org)
Marine sediments comprise one of the largest microbial habitats and organic carbon sinks on the planet. (darkenergybiosphere.org)
Here we investigate patterns in the distribution of microbial cells, organic carbon, and the amounts of power used by microorganisms in global sediments. (darkenergybiosphere.org)
Sulfate profiles are linear between the surface sediments (upper ∼20 cm) and the top of the SMTZ (∼105 cm) giving the appearance of refractory particulate organic carbon (POC) burial and conservative sulfate behavior in this intermediate region. (yale.edu)

The Tertiary Period began 70 million years ago, with deposits of marine and fresh- to brackish-water sediments. (uky.edu)
However, in many continental margin settings, reduced carbon can also be added to sediments from below-for example, from "deep" geologic hydrocarbon reservoirs derived from ancient source rocks or from the decomposition of deeply buried gas hydrate deposits. (yale.edu)

Using stratigraphic information derived from numerous boreholes across the region paired with geologic and geomorphologic constraints, we develop a depth-to-bedrock model for the greater Boston region. (usgs.gov)

In a recent study published in Frontiers in Marine Science , authors used existing reports of methane and sulfate flux values to the SMTZ and synthesized a carbon flow model to quantify the DIC cycling in diffusive methane flux sites globally. (us-ocb.org)
These pathways must be included in coastal and geologic carbon models. (us-ocb.org)
The marine carbonate factory is one piece of a bigger puzzle, the carbon cycle, which encompasses the cycling of carbon through nature. (yalescientific.org)
When they die, these shells and other sediments form rock, sequestering carbon within the ocean floor and the geologic record. (yalescientific.org)
Carbon cycling in Santa Barbara Basin sediments: A modeling study" by David J. Burdige, Tomoko Komada et al. (yale.edu)
To examine the impact of these two differing reduced carbon inputs on sediment biogeochemistry, a modified reaction-transport model for anoxic marine sediments is described here and applied to data from sediment cores in Santa Barbara Basin to a depth of 4.6 m. (yale.edu)

The term sedimentary rock applies both to consolidated, or lithified sediments (bound together, or cemented) and unconsolidated sediments (loose, like sand ). (jrank.org)

however, they sometimes occur as impressions or carbonized films in finely laminated sediments. (britannica.com)
However, model results show that linear profiles may also occur when high rates of sulfate reduction occur near the sediment surface (as organoclastic sulfate reduction [oSR]) and in the SMTZ (largely as anaerobic oxidation of methane) with low, but nonzero, rates of oSR in-between. (yale.edu)

One of the major branches of paleontology is invertebrate paleontology, which is principally concerned with fossil marine invertebrate animals large enough to be seen with little or no magnification. (britannica.com)

The comprehensive interpretation, combining this new data set with available geologic and geophysical data, was undertaken by CGG's in-house interpretation team in Houston. (scandoil.com)
A full geophysical interpretation report, which includes mapping of basement, sediment and any intrusives or salt which may be present, will provide important insights to exploration and de-risking of prospective areas by oil companies. (scandoil.com)
GeoView teams with Spotlight Geophysical Services for marine Seismic Refraction and Marine Seismic Reflection Surveys. (geoviewinc.com)

Investigation into the formation of coastal sediments on a mid-ocean volcanic island with trips to several of Kauai's world famous beaches. (teok.com)
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)

On day-cruises offshore of Galveston Island they collect seismic data, multibeam data, and sediment samples. (utexas.edu)
Undergraduates Angela Cai and Harry Hull process seismic data collected from a marine cruise the day prior. (utexas.edu)
Greg Paleolog, Senior Vice President, Multi-Physics, CGG, says, "The results of this first survey in our wider airborne GravMag program offshore Mexico reinforce our belief that this extensive new program, when combined with our other seismic, geologic and satellite multi-client data in Mexico, will give the industry access to a unique geoscience library to support the future exploration and economic development of this high-potential area. (scandoil.com)
These include Sub-bottom profiling, Marine Seismic Refraction and Marine Seismic Reflection. (geoviewinc.com)

The tuff (the Kv formation) is the most dissimilar geologic unit, with significantly different concentrations of 14 metals. (cdc.gov)
After acknowledging the inherit differences between the two media, ATSDR noted that the soil of Vieques has higher concentrations of antimony, arsenic, cadmium, calcium, manganese, molybdenum, silver, strontium, and yttrium than the stream sediment samples collected throughout the mainland of Puerto Rico. (cdc.gov)
As he and colleagues detail in an article published today in Proceedings of the Royal Society B , sudden blooms of many types of algae can produce high concentrations of toxins that quickly kill large herbivorous marine mammals when they inhale or eat them. (smithsonianmag.com)
The Baltic sea suffers from high nutrient concentrations and large areas of hypoxic water and sediment and several methods to cure this area are suggested. (lu.se)

However, a significant portion of subsurface methane is consumed within shallow sediments via microbial driven anaerobic oxidation of methane (AOM). (us-ocb.org)
In areas with high rates of microbial respiration, O 2 penetrates only millimetres to centimetres into the sediments, but active anaerobic microbial communities are present in sediments hundreds of metres or more below the sea floor. (darkenergybiosphere.org)

[248] Eighty to eighty-five percent of Earth's land surface does not have even 3 of the 10 "geologic periods" appearing in the correct consecutive order required by Evolutionism. (christiananswers.net)
Despite its important role in ocean chemistry, there has been little consensus on how the marine carbonate factory has changed throughout Earth's history. (yalescientific.org)

Our results show that sediment on continental shelves and margins is predominantly anoxic and contains cells whose power utilization decreases with sediment depth and age. (darkenergybiosphere.org)

Polycystine radiolaria are exclusively marine protists and are found in all ocean waters, from polar regions to the tropics, and at all water depths. (nhbs.com)

Geochemical Study of Sediment Contamination in New Bedford Harbor, Massachusetts. (epa.gov)

Characterization of actinomycetes of marine sediment and their antagonistic activity against Vibrio sp. (edu.pe)
The aim of the present study was to evaluate the antagonistic activity of a collection of 24 actinomycetes of marine sediment against wild species of Vibrio. (edu.pe)
Actinomycetes were characterized by their growth in Marine Agar and their extracellular enzymatic activity on different substrates. (edu.pe)
Dive into the research topics of 'Characterization of actinomycetes of marine sediment and their antagonistic activity against Vibrio sp. (edu.pe)

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)
Weathering of igneous, metamorphic, and sedimentary rocks produces rock fragments, or clastic sediments, and mineral-rich water , or mineral solutions. (jrank.org)
Due to their interlocking crystals, chemical sediments always form consolidated sedimentary rocks. (jrank.org)
Geologists use this information to interpret the geologic history of an area, and to search for economically important rocks and minerals. (jrank.org)
Covering the Precambrian rocks are Paleozoic marine rocks, predominately limestones, that record shallow seas having spread across the once level Precambrian landscape. (nmsu.edu)
The San Andres and Franklin Mountains are mainly composed of these Paleozoic marine rocks. (nmsu.edu)

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)

This information reflects geologic interpretations from over 20 years ago and do not necessarily represent an accurate interpretation of currently accepted geologic theory. (md.gov)

The precipitation pathways of carbonate minerals in the ocean are referred to as the marine carbonate factory and greatly influences abiotic and biotic geochemistry, including ocean acidity. (yalescientific.org)
However, Lidya Tarhan, an assistant professor of earth and planetary sciences, and Jiyuan Wang, an Agouron postdoctoral fellow in Tarhan's research group, along with colleagues from Yale's Department of Earth and Planetary Sciences, Northwestern University and University of Miami, recently developed a novel technique to trace the history of the marine carbonate factory. (yalescientific.org)
However, many marine organisms also use calcium and carbonate ions to build their shells. (yalescientific.org)
This study exploited the incorporation of strontium into carbonate precipitates to gain insight into the history of the marine carbonate cycle. (yalescientific.org)
The ratio of these strontium isotopes in carbonates, in particular, is a novel proxy for the history of the marine carbonate cycle because this signature is tied closely to precipitation rates, rather than-like many other isotope systems-seawater temperature or the type of carbonate mineral in which strontium is incorporated. (yalescientific.org)
Thus, strontium stable isotope ratios can serve as a marker for changes in the marine carbonate factory, specifically the rate of carbonate precipitation which, in turn, reflects marine carbonate saturation state at the time of precipitation. (yalescientific.org)

The ages of geologic material in the Jornada vicinity range from Precambrian granites to Historical eolian and arroyo sediments. (nmsu.edu)

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)
The Sanctuary's research vessel, R/V Auk, visited 33 locations on Stellwagen Bank at which a customized Van Veen grab sampler (SEABOSS) equipped with a video camera and a CTD 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)

However, when ATSDR compared the background sediment samples collected in the former NASD to the sediment data collected on the mainland of Puerto Rico, the levels of metals from the former NASD are lower or in the low end of the range. (cdc.gov)

lt;span>In this study, we evaluate the effect of strong sediment/bedrock impedance contrasts on soil amplification in Boston, Massachusetts, for typical sites along the Charles and Mystic Rivers. (usgs.gov)

None of the sediments exposed at the surface in Monmouth, Ocean, Atlantic or Cape May Counties are cemented to form bedrock like that found along the New England coast. (stockton.edu)
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)
The sediment/bedrock interface in this region results in an impedance ratio on the order of ten, which in turn results in a significant amplification of the ground motion. (usgs.gov)

After evaluating the soil geologically to identify any chemical trends between geologic units (e.g., rock formations) on Vieques, ATSDR concluded that significant differences existed in the metal composition of soils developed on the different geologic units. (cdc.gov)

This cruise was conducted in collaboration with the Stellwagen Bank National Marine Sanctuary, and the data collected will aid research on the ecology of fish and invertebrate species that inhabit the region. (usgs.gov)
The brachiopods then reached a low, but steady, equilibrium over the past 250 million years in which there wasn't a surge or a crash in species' numbers, and still live on today as a rare group of marine animals. (livescience.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)

I respectfully take issue with the program's interpretation that the 39 backwater sediment layers in the Walla Walla River valley in Washington state are the result of 39 repeat Missoula floods. (creation.com)

Graduate student Catherine Ross separating a sediment sample by grain size using a sequence of sieves. (utexas.edu)

The data can help reveal the geologic history of the Texas coast. (utexas.edu)
No matter, the staff is looking for clues of the geologic and paleontological past, or History of the Earth, through the vast collection of fossil invertebrates. (carnegiemnh.org)

In the Horizon 2020-funded project Baltic Gender ( www.baltic-gender.eu ), our aim was to increase the proportion of women in senior positions in marine science technology in countries surrounding the Baltic Sea. (lu.se)

A small proportion of types of organisms has undergone little or no apparent change over long intervals of geologic time, but most organisms have progressively changed, and earlier forms have become extinct and, in turn, have been succeeded by more modern forms. (britannica.com)

Under the right conditions, minerals precipitate out of mineral-rich water to form layers of one or more minerals, or chemical sediments. (jrank.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)
Geologist J Harlen Bretz in 1923 was the first to propose a radical geologic theory-that huge geologic features in America's Pacific Northwest were formed by catastrophic water flow. (creation.com)
Excellent animation recreates the action of super-cooled water under pressure which undermined the ice dam, causing dam failure and the catastrophic release of 540 cubic miles of water (1,400 km 3 ) in just days-creating the scablands and backwater sediments. (creation.com)
Dermatitis caused by skin contact with contaminated fresh or marine water. (cdc.gov)
N. fowleri and thermophilic amebae were detected in recreational water and sediment samples throughout the facility. (cdc.gov)

Layers of fine sediment from a flood of very limited extent have been found at several ancient cities of Mesopotamia. (biblicaltraining.org)
Hence these terms applied to flood sediment must be taken in the general sense to indicate their fine-grained size and not in the technical sense to distinguish between silt and clay or to indicate composition. (biblicaltraining.org)
Barton indicates that "there is no real proof" that either of the sediment layers (Ur or Kish) were deposited at the time of the Biblical Flood. (biblicaltraining.org)
Narrator: "It was assumed that these layers were formed by changes in the speed of one giant flood … known as pulses … But that was before he [Richard Waitt] discovered something odd: a white line within the sediments, a layer of Mount St. Helens ash about 15,000 years old. (creation.com)
Our Northwest team is convinced that the 39 backwater sediment layers in the Walla Walla River valley were laid down by a single Lake Missoula flood. (creation.com)

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)

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