The saltwater plesiosaur Leurospondylus has been found in marine sediments in the Horseshoe Canyon, while freshwater environments were populated by turtles, Champsosaurus, and crocodilians like Leidyosuchus and Stangerochampsa.

Scientific consensus is that these fossils were eroded from their original locations and then re-buried in much later sediments ( also known as reworked fossils ).

They work on the premise that, although different sediments may look different depending on the conditions under which they were laid down, they may include the remains of the same species of fossil.

If the species concerned were short-lived ( in geological terms, lasting a few hundred thousand years ), then it is certain that the sediments in question were deposited within that narrow time period.

In his paper, he explained his theory that the Earth must be much older than had previously been supposed in order to allow enough time for mountains to be eroded and for sediments to form new rocks at the bottom of the sea, which in turn were raised up to become dry land.

Friction was higher in that direction because the sediments were thinner and probably consisted of coarser grained material resistant to sliding.

Plains in many areas are important for agriculture because where the soils were deposited as sediments they may be deep and fertile, and the flatness facilitates mechanization of crop production ; or because they support grasslands which provide good grazing for livestock.

The Pyrenees are older than the Alps: their sediments were first deposited in coastal basins during the Paleozoic and Mesozoic eras.

Relics of the city were being found in the Wadden Sea until the late 20th century, but shifting sediments have carried the last of these into the sea.

In some of the sections of the Saudi coast that sustained the worst damage, sediments were found to contain 7 % oil.

The glacial sediments of the Makganyene formation of South Africa are slightly younger than the Huronian glacial deposits (~ 2. 25 billion years old ) and were deposited at tropical latitudes.

The flood waters were exacerbated by the sediments washed down by the millions of tons by hydraulic mining, which filled the beds of the Sacramento, Feather and American rivers up to in Sacramento and also covered thousands of acres of Central Valley lands.

Since these sediments were light, they crumpled into mountain ranges rather than sinking to the floor.

These represent periods where no new sediments were laid down, or when earlier sedimentary layers raised above sea level and eroded away.

They work on the premise that, although different sediments may look different depending on the conditions under which they were laid down, they may include the remains of the same species of fossil.

If the species concerned were short-lived ( in geological terms, lasting a few hundred thousand years ), then it is certain that the sediments in question were deposited within that narrow time period.

A major part of carbon dioxide exhalations were soon dissolved in water and built up carbonate sediments.

Rock formations in Greenland comprise sediments dated around 3. 8 Ga and are somewhat altered by a volcanic dike that penetrated the rocks after they were deposited.

Banded layers rich in iron were a common feature in sediments for much of the Earth's early history but are now rare.

This suggests that sizeable amounts of dissolved oxygen were available to form sediments rich in Fe ( III ).

In contrast to the underlying sediments of the Ludlow Series which were deposited in a shallow warm sea some 400 million years ago, the Ludlow Bone Bed represents terrestrial ( land ) conditions and thus a fundamental change in the landscape.

The meta-igneous rocks were derived from volcanic island arcs, while the metasediments represent deep-sea sediments eroded from the neighboring island arcs and deposited in a forearc basin.

Coastal lagoons tend to accumulate sediments from inflowing rivers, from runoff from the shores of the lagoon, and from sediment carried into the lagoon through inlets by the tide.

All types of sediments which may be composed of clay, sand, silt, and rock can be carried into wetland systems through this process.

Periglacial ( Glacial ) loess is derived from the floodplains of glacial braided rivers that carried large volumes of glacial meltwater and sediments from the annual melting of continental icesheets and mountain icecaps during the summer.

In places of re-entrance along a coastline ( such as inlets, coves, rias, and bays ), sediments carried by a longshore current will fall out where the current dissipates, forming a spit.

Due to the continuous lifting of the Alps and the Apennines to the sea withdrew from this gulf and the accumulation of sediments carried by the rivers gave rise to a flood plain which corresponds to the Po Valley.

Fore-arc sediments progressively carried northwards by the Indo-Australian Plate have been folded and faulted forming Timor island.

Dredging is an excavation activity or operation usually carried out at least partly underwater, in shallow seas or fresh water areas with the purpose of gathering up bottom sediments and disposing of them at a different location.

After the Yellow River shifted back to its northern course in 1853, the marshes were gradually filled in by sediments carried downstream by the river and human land reclamation.

Sediments worn off the Death Valley region were shed both east and west and carried by wind and water ; the eastern sediments ended up in Colorado and are now famous for their dinosaur fossils.

In sediments, a lot of the magnetic remanence is carried by minerals that were created by magnetotactic bacteria, so rock magnetists have made significant contributions to biomagnetism.

Samplings of sediments in the Black Sea by a series of expeditions carried out between 1998 to 2005 in the frame of a European Project ASSEMBLAGE and coordinated by a French oceanographer, Gilles Lericolais, brought some new inputs to the Ryan and Pitman's hypothesis.

Carbonates and fine sediments from the Alleghanian orogeny were carried farther west to form limestone rocks in a shallow sea that was later uplifted and forms the bulk of Tennessee, Kentucky, Ohio, and Indiana.

A till plain is an extensive flat plain of glacial till that forms when a sheet of ice becomes detached from the main body of a glacier and melts in place, depositing the sediments it carried.

Dredging activities are set to begin upon completion of the CDF, and are planned to be carried out over a period of 10 years to finally return the harbor to its authorized dredge depths, with an additional 20 years of maintenance dredging to remove future accumulated sediments.

Ocean deposited parent materials, called marine sediments, are collections of material that have been carried by rives and streams to the ocean and eventually sink to the bottom.

Large amounts of coarse gravel and boulders carried along underneath the glacier provide the abrasive power to cut trough-like glacial grooves, and finer sediments also in the base of the moving glacier further scour and polish the bedrock surface, forming a glacial pavement.

The Bahoruco River carried the pectolite bearing sediments to the sea.

By about 12 million years ago in the Miocene, the Eridanos had reached the North Sea area where sediments carried by the river built an immense delta.

A measure of the total mass accretion of meteoritic material by the Earth is obtained from analyses of deep-sea sediments and dust collected in remote regions ( Pettersson, 1960 ).

The most productive portion of arable land is that from sediments left by rivers and the sea in geological times.

Amphibian survival resulted from the clade's ability to seek shelter in water or to build burrows in sediments, soil, wood, or beneath rocks.

Since direct observations of climate are not available before the 19th century, paleoclimates are inferred from proxy variables that include non-biotic evidence such as sediments found in lake beds and ice cores, and biotic evidence such as tree rings and coral.

It uses evidence from ice sheets, tree rings, sediments, coral, and rocks to determine the past state of the climate.

Soil erosion ( especially from agricultural activity ) is considered to be the leading global cause of diffuse water pollution, due to the effects of the excess sediments flowing into the world's waterways.

With the exception of Entamoeba gingivalis, which lives in the mouth, and E. moshkovskii, which is frequently isolated from river and lake sediments, all Entamoeba species are found in the intestines of the animals they infect.

The whale feeds mainly on benthic crustaceans, which it eats by turning on its side ( usually the right, resulting in loss of eyesight in the right eye for many older animals ) and scooping up sediments from the sea floor.

For instance, a granite which is formed from melted sediments may have more alkali feldspar, whereas a granite derived from melted basalt may be richer in plagioclase feldspar.

Many large granite plutons are the sources for palaeochannel-hosted or roll front uranium ore deposits, where the uranium washes into the sediments from the granite uplands and associated, often highly radioactive, pegmatites.

All of the Island's towns are at threat from rising sea levels while the Northern Plain, a large, flat and low-lying plain composed of soft marine sediments and glacial material, which makes up about a quarter of the Island's landmass, is in danger of being lost to the sea over the next two centuries.

These sediments then provide an anaerobic environment which protects from further degradation.

Thus the Mary Rose was subject to salvage from the sixteenth century and later, but a very large amount of material, buried in the sediments, remained to be found by maritime archaeologists of the twentieth century.

Since uplift and erosion are more or less in equilibrium in the Himalaya, rapid uplift is balanced by annual increments of cubic kilometers of sediments washing down from the mountains, then on the plains settling out of suspension on vast alluvial fans or inland deltas over which rivers meander and change course at least every few decades, causing some experts to question whether manmade embankments can contain the problem of flooding.

If water-saturated zones still exist in sediments under the volcano, they would likely have been kept warm by a high geothermal gradient and residual heat from the volcano's magma chamber.

** Till plain, a plain of glacial till that forms when a sheet of ice becomes detached from the main body of a glacier and melts in place depositing the sediments it carries.

Additionally, flaplings are normally found in the same sediments as adults and juveniles of the same species, such as the Pterodactylus and Rhamphorhynchus flaplings found in the Solnhofen limestone of Germany, and Pterodaustro flaplings from Brazil.

This is because even though evolutionary change appears instantaneous between geological sediments, change is still occurring incrementally, with no great change from one generation to the next.

While uranium is water-soluble, thorium and protactinium are not, and so they are selectively precipitated into ocean-floor sediments, from which their ratios are measured.

The few remaining salt marshes now represent most of California's remaining salt marsh, supporting a number of endangered species and providing key ecosystem services such as filtering pollutants and sediments from the rivers.

The northwest coast is part of the deep Cauvery ( Kaveri ) River Basin of southeast India, which has been collecting sediments from the highlands of India and Sri Lanka since the breakup of Gondwanaland.

) of Royal Holloway, University of London who studied rock formations in Flinders Ranges in South Australia, formed from sediments dating to the Sturtian glaciation, which bear the unmistakable mark of turbulent oceans.