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Sentence Examples The parent stem was situated on mineral sediments inside the mound 1 m from the dated sample. The formation of pockmarks within muddy sediments is suggested to be caused by the interaction between sediment fluidization and bottom currents. In Iceland the impact of Viking farmsteads on the land can be dated by analyzing layers of volcanic ash in soils, sediments, and ice caps. Similar sediments, overlying a laterite soil and an associated silcrete horizon, are known from the Sidmouth area. The sediments are finely laminated mudstones, formed in an outer shelf detrital belt, in quiet water environments. Stout beardfish are associated with soft-bottom habitats, where they use their chin barbels to probe the sediments for food. We had sediments, river mud, pebbles rounded by water action, even the remains of aquatic plants on the site. Most deep-sea trenches in the Pacific are floored by normal basaltic oceanic crust overlain by pelagic sediments and ash. Biostratigraphic analysis of sediments provided detailed chronostratigraphic and palaeoenvironmental constraints on the geophysical framework. Subsequently the massive sulfide deposit and surrounding metalliferous sediment apron were covered by oceanic radiolarian chert sediments. The sediments that form tombolos often form in ridges along an underwater wave-cut terrace. The sediments from Dunure are frequently rippled and show examples of dewatering structures, desiccation cracks and foam marks. Hill was able to surmount major obstacles like environmental testing of the sediments. Dolomite as a possible product of bacterial methanogenesis is absent in sediments from the Marnes Bleues Formation. Palaeosol horizons are interbedded with these units, representing the pedogenic alteration of exposed floodplain sediments. Geologists suggested the layers may have been formed either by ash from a volcano or from sediments deposited by wind or liquid water. Rhynie fossils were preserved when mineral sediments settled around and on top of the organic matter and compressed them. Clogged weirs slowed the current even more, encouraging ever-finer suspended sediments to settle. Over eons these sediments became buried beneath layers of mud and ash caused by forest fires, more volcanic eruptions, rains and upheavals. He believed that the feeder dykes terminated in the sediments at approximately the same depth as the zero isopach of the sill. Show More Sentences Within a few days of being placed in the sediments, prototype fuel cells were producing several milliwatts of power. The contact between Cretaceous Chalk and Palaeogene siliciclastic sediments is a megasequence boundary within the fill of the Wessex Basin. It is composed of a number of imbricate thrust units involving Ordovician to Devonian sediments, volcanic rocks and ophiolites. Slope sediments consist of a medium-grained, bioclastic floatstone to rudstone with abundant bryozoans, bivalves and branching coralline algae. Such sediments and ichnofacies suggest lag deposits winnowed in proximal storm-generated beds. These factors combine to make lacustrine sediments amenable to very high-resolution paleoenvironmental and paleoecological reconstruction. A prominent negative carbon isotope pulse lasting a few 10 years has been identified in Oxfordian sediments. The thickness of this package of sediments is impossible to measure because of the subsequent folding and overthrusting that have taken place. The lower parts of the two successions consist of very thick, compositionally immature, dominantly shallow marine siliciclastic sediments. The sediments were transformed into tectonic ironstones upon shearing and associated silicification. These are overlain by low-grade metamorphosed sediments and volcanics of Ordovician and Silurian age. Eocene, Miocene, and Pliocene sediments are found on Peninsula Arauco, the area of the type locality, and no new material has been found. Farther south in Colorado, sediments accumulated in deeper-water submarine fans deposited by subsea, sediment-laden, density flows. In the fort section area, the delegates said the area represents sediments of the Bathonian age. They are semantic dead matter, uncoloured by interiority, sediments of experiences or thoughts now forgotten. The Brushy Basin sediments contain numerous chalcedony pseudomorph-after-barite concretions that range to more than 30 cm in diameter. Eventually their bodies were mummified, preserved, and fossilized as the caves filled with sediments. Reflection records over the main plateau reveal smoothly-layered, undistorted sediments overlying a relatively smooth basement surface. The contribution by Manning emphasizes the similar processes that occur in subaqueous sediments and in landfill sites. The Greenlander tribe speak of a time when water covered the continents, and that is when the sea creatures were entombed in the sediments. Show More Sentences During the Paleocene, almost all of the decapod occurrences were in fine siliciclastic sediments. Between the two horizons, occasional bands of brackish corbiculids intercalate with sediments containing freshwater gastropods and charophytes. The preserved Miocene sediments have allowed us to separate the effects of Palaeogene and Neogene uplift. But since then, the violent upthrusting of the Andean chain has carried the sediments to the tops of mountains. It is on the continental shelves where shelf, epeiric, neritic, or epicontinental sediments are deposited. Approaches to cave sediments by archaeologists and geoarchaeologists have typically been borrowed directly from sedimentology or soil science. In the process of being buried under other sediments, these ooids can fuse into a solid mass of sedimentary rock called oolite. These sediments, called varved clays or simply varves, are the primary habitat of Axarus larvae. We have obtained and analyzed cores of varved sediments from Cheakamus, Green, and Glacier lakes. Quartz is the dominant mineral in veins in siliceous rocks, calcite in limestones, and gypsum in gypsiferous sediments. These sediments, surrounded by older rocks, were originally called outliers. The blood samples were centrifuged and plasma was removed without disturbing the buffy coat and erythrocyte sediments. Other examples of relative isotopic dating are the deuterium variations in ice cores and the osmium isotope record of marine sediments. When buried by later sediments, clays can undergo changes in their mineralogy, a process known as diagenesis. The sediments are partly clastic and partly volcaniclastic because volcanism is active along such margins. George believed that the Grand Canyon had a soul, that it wasn't merely rocks, strata, and accumulated layers of lava and sediments. Marine sediments are typically rich in calcium carbonate from shells, but increased acidity causes it to dissolve. Australian coals and associated carbonaceous sediments may thus well be oil source rocks in the Gippsland basin area and elsewhere in Australia. Other fish, such as the black carp and mud carp, foraged in sediments at the bottom of the pond. Burrowing heart urchins have bands of very fine spines that are termed fascioles that help them live in fine sediments. Show More Sentences The sediments form both relatively thick formations and thin intercalations between basalts. The sediments were deposited under alternately freshwater and marine conditions. However, most modern dinocysts reach sediments before germination, and some of these can fossilize without excystment structure formation. Spiders are rarely fossilized since they have no hard skeleton and usually thrive away from water, where sediments ideal for fossils accumulate. The accumulation of gases from the decomposition of organic detritus leads to the formation of what are called gas hydrates in marine sediments. Much of the craton remained stable up to Triassic time, with sedimentary sequences dominated by shallow-water and subaerial sediments. It retreated in subsequent periods of prolonged dryness, leaving deposits of sediments. At each sample site, the least diagenetically modified, coarser grained sediments from laminae of dune couplets were selected for analysis. This is based on the occurrence of trace fossils, principally on the abundance of intensely churned sediments there. Deposited sediments are conformable on top of those of the South Bashkirian Basin. Comparisons with the potential source rocks of these sediments suggest little alteration during sediment transport and diagenesis. Note the rounded boulders in the fluvial sediments, and the mixing of gypsiferous and quartzose lithologies at places on the outcrop. It is probably an inhalant opening that allowed these creatures to live half-buried in the bottom sediments, like modern rays. The influent waters carry not only solute loads, but also sediments both in suspension and along the bed of the streams. Coarse alluvial-fan sediments change abruptly basinward into lacustrine sediments. The incoming sediments beneath the 3 km deep Oman abyssal plain consist of 3 km of Makran sands that are derived from the north. Geologists know it as an area of mysterious abyssal hot spots where sediments may hold millions of dollars worth of precious metals. At the extreme tidal limits in wet areas, organic production may exceed sediment supply and peaty organic sediments may then accumulate. Late Tertiary and Quaternary glacial, alluvial and lacustrine sediments are widespread adjacent to the mountains and in intermontane basins. Recently deposited sediments are unstable mixtures of terrestrial weathering products and organic matter. Show More Sentences In marine sediments marine phytoplankton are widely used in biostratigraphy. Because of their non-marine depositional setting, the Wealden sediments are not biostratigraphically constrained with a high degree of certainty. Until recently, sauropod body fossils and ichnofossils were known only from Jurassic and Cretaceous sediments. Mud volcanoes indicate that this subcretion occurs where dewatering stiffens the subducted sediments. The bulk of the sediments on the outer margin are of Eocene to Oligocene age with thin units of younger sediments on top. The floor of the print tends to be drawn upwards as the animal withdrew its foot from wet and sticky sediments. Gravitational sediments can enter a cave system in the form of entrance talus material, colluvium, roof fall, or phreatic infiltrates. The seismic data show faulting of the subsurface sediments, possibly as dikes were injected into the center of the basin. Second, reconstruction of some of the sediments as deposited by fluviatile action suggests that fluvial transport affected the assemblages. The sediments were laid down in the late Pleistocene as broad alluvial fans derived from the nearby Santa Monica Mountains. There are no federal environmental or health standards for arsenic or copper in lake sediments. The Copper River alluvial fan is an outwash plain, that is, formed from sediments deposited by glacial meltwater. Rocks that lie at an angle must have been tilted after the sediments were consolidated. There is nothing to slow the wind-caused currents or keep the sediments from resuspending. Early models assumed that all magnetotactic bacteria are microaerophiles and indigenous in sediments. The sediments include lacustrine freshwater limestones, silts, marls, occasional sands and local lignite. Almost all of these are away from major rivers, dry creeks, and sagebrush flats, where recent sediments tend to cover the older rocks. Uppermost Permian and Triassic terrestrial sediments conformably overlie the terminal volcanic rocks. The littoral sediments of the experimental lakes are primarily flocculent organic material including abundant epipelon. Tertiary sediments cause subsidence of the basin substrata 2.3 km below sea level, as a result of the sediment load. Show More Sentences The fluvial sediments, however, represent rapid deposition in relatively short periods. These sediments accumulate to form the large, gentle slope of the continental rise. White-sand soil is almost pure quartz material derived from sediments that are more than 570 million years old. The mine is designed to camouflage itself into the ocean sediments, much like a flounder or stingray does. The combined isotopic data suggest derivation of the sediments from at least three distinct crustal source regions. Rust, scale, sand or other sediments can clog any activated charcoal filter. The sediments are noted for their rich ammonoid faunas, which allow detailed biostratigraphic subdivision and correlation. Higher, steeper slopes of the Vosges have thin topsoil, with subsoils of weathered gneiss, granite, sandstone, schist, and volcanic sediments. We propose that these sediments were deposited in a forearc or back-arc basin of the Oytag arc. If not flushed regularly the bacteria slimes and manganic oxide sediments accumulate in the pipes. The bay bottom is characterized mainly by fine-grained terrigenous sediments with a considerable admixture of terrestrial organic matter. For an egg bank to maintain its value as a historical record, the sediments should have little or no disturbance. The cross-bedded sediments correspond to shoal deposits that developed on top of and seaward of the spit-platform. The sediments that produced the beds were deposited in moderately deep waters located a hundred meters seaward of the escarpment. Oceanic sediments on top of the basalts crop out on the northern margin of the ophiolite. Areas of overlying sandy sediments were removed to expose the fossiliferous clay. The generally immature nature of the palaeosols indicates that most vegetation colonized newly deposited fluvial sediments. The Liva Member includes parts of the formation composed of basic lavas and tuffs with only minor interbedded sediments. It is naturally found in sediments, and adhesion data for glass and polystyrene are available. One learns to look along the perimeters of fossil woodpiles, where the sediments still demonstrate the appropriate coarse-grained textures. Show More Sentences Paleocene and Eocene sediments were deposited on a polygenetic sub-Paleogene surface. A repeating sequence of fining-upward sediments commonly capped by coaly layers is indicative of fluvial sediments. Stones dropped from melting Canadian icebergs have been found in sea sediments off the coast of Portugal. We found high concentrations of CPP516 in surficial sediments and particulate matter collected in sediment traps. The Atlantic and Gulf Coastal Plains of the United States contain assemblages preserved as original aragonitic and calcitic material in unconsolidated sediments. It and many other old zircons come from metamorphosed sediments deposited in river deltas some 3 billion years ago in what is now southwestern Australia. The team found several species of archaic proboscideans called Palaeomastodons previously known from 32-million-year-old coastal sediments in Fayum, Egypt. Allochthonous sediments enter the cave system through a number of processes, including aeolian, fluvial, colluvial, biogenic, glacial, marine, and human activity. In this case the folds found within the Miocene sediments have been interpreted as extensional folding in the form of the ramp anticlines and drag folds. These detrital sediments have, however, been investigated archaeologically only to a depth of less than five meters in any part of the Niger Delta. Yet as the levees channeled the water, they also kept fresh soil carried by the muddy Mississippi from replenishing the sediments that made up the lowlands. It was obvious, even in the 1950s, that the sediments of the historic spring floods no longer reached their natural resting grounds in levees, swamps, and marshes. Instead of being swallowed up, as in a typical rift valley, the sediments are spread widely over the basin or anywhere that is slightly lower than the uplifted area. Emiliani was convinced that the way to calculate the number of ice ages in the recent past was to look at deep-sea sediments. Testing of samples of deposited sediments in the riparian zone determined that agricultural activity in the watershed has caused increased sediment deposition to the wetland. Scientists hope that some of those rocks contain sediments that will reveal information about past conditions in the crater, which could be a dry lake bed. One trichopteran family that is unknown from the Messel sediments has been identified from the intestinal contents. Some Trichopteran species construct tubular retreats along the surfaces of rocks or within stream bed sediments. The sandstone dykes and surrounding sediments were subject to petrographical analyses in order to gain a better understanding of their relationships. Preserved sediments record deposition in a periglacial to ice-margin lake that contains one of the earliest assemblages of freshwater arthropods from Gondwana. Show More Sentences Aquatic sediments host much of the bacterial biomass and biodiversity and play a key role in biogeochemical cycles. The resulting hogbacks, composed of Mesozoic sediments, can readily be seen dipping away from the mountains by those approaching the beautiful isolated peaks. The magma contains components of the sediments and weathered oceanic crust from the Nazca plate as well as the peridotite in the mantle beneath South America. Ghanem et al. referred to the Hammamat Group as molasse-type sediments that consist of polymictic conglomerate, arkose, greywacke, siltstone and minor mudstone. Most dens or attempted dens are in peat banks beneath krummholz spruce and occasionally in peat banks without any trees, or in inorganic sediments along eroded river banks. Radium activity in pore water of wetland sediments often differs from the amount expected from local production, decay, and exchange with solid phases. The inorganic sediments were covered with poorly decomposed fibric peat accumulations that contained well-preserved rudiments of earlier communities. In addition, there is a thin veneer of sediments covering the subducting plates, which contain large volumes of unbound pore water and water and carbonate-bearing minerals. Because of their hardness palaeosols influence the landscape and commonly cap hills or coat slopes, protecting the underlying sediments from erosion. Hence, laminated sediments may have been preserved in shallower water than is normal today. This organic debris is considered the original source for some chemical cave minerals but is also associated with the generation of autochthonous clastic sediments. The youngest sediments in the distal Karamba complex within the Indus Suture Zone are Campanian, which suggests that thrusting occurred during the Late Cretaceous. The distribution of aquatic macrophytes in shallow lakes is related in various ways to the physical characteristics of the lakes and their bottom sediments. In addition, secondary topaz crystals, released from matrix by erosional forces, have been found in both alluvial and colluvial sediments adjacent to topaz-bearing pegmatites. The sinistrally transtensional Louisburgh Basin contains PrIdolI fluviatile sediments and, probably, dates the end of transpressional deformation. Evidence of pluvial lakes have been used in the reconstruction of palaeoclimates, using shoreline evidence and analysis of lake sediments to link lake levels to climate. Beneath a thin veneer of Pleistocene sediments, it encountered a thick sequence of Cenozoic and Jurassic strata separated by major unconformities. Here, specimens of the shallow subtidal-intertidal cockle Katelysia rhytiphora have moved up profile from lagoonal facies into advancing aeolian dune sediments. Estuarine sediments present a particularly challenging problem for anyone attempting to predict the consequences of human modifications to the structure of an estuary. Gentle but steady water movement produced by slow flow through lakes and meandering backwater stream channels provides aeration and slow accretion of alluvial sediments. Show More Sentences More specific questions might relate to taphonomic conditions, identification and temporal assessment of disconformities, or the nature of specific anthropogenic sediments. In addition, the sediments have suffered remarkably little burial and thermal alteration and contain well preserved marine organisms and terrestrially derived plant remains. In anoxic bank sediments, respiration was also much greater than chemoautotrophy, but was entirely anaerobic. The covering of the basin floor during periods of enhanced moisture conditions allows the deposition of lacustrine sediments such as marls and clays. Carbonaceous sediments were deposited over a wide range of environments. Therefore one may reasonably assume that fluid circulation inside unconsolidated sediments must play an active role in settling sedimentary structures. Although, ironically, the lack of rain in recent years has made the problem worse, as winter flows can help flush sediments through the system and out to sea. Natural features such as the Shark River Slough form a major coastward conduit for freshwater and terrestrial materials that influence and contribute to marine sediments. Suddenly the entire structure, built on the unconsolidated sediments of the Tagus RAver estuary, sank into the sea, as if swallowed up by the devil himself. It can contain salts, metals, and sediments that are sometimes toxic or radioactive. Diverting water from the Nile River, along with buildup of sediments trapped behind dams and barrages, has caused the fertile Nile Delta to shrink. The southsouthwestern boundary of the Indus Basin sediments is the shear zone of the Indus suture, with an ophiolitic melange exposed near Chilling. In the central and eastern parts of the range, the northern margin is also sharply defined, but separates bedrock from glacial and alluvial sediments or bedrock inliers. In most, if not all, cases it is clear that volumetric contraction has occurred with horizontal contraction of the sediments complementing the heave of the faults. Gas hydrate is found in sub-oceanic sediments in the polar regions and in continental slope sediments, where pressure and temperature conditions combine to make it stable. The introduction of the electron probe and the ability to date individual grains has increased the chances of identifying source rocks of sediments. The granite sea wall, which is being constructed on the northern side of the port's main breakwater, will be built to contain basin sediments dredged from the harbour. These basins were interpreted to contain thick Old Red Sandstone sediments and to have resulted from the extensional collapse of thickened Caledonian crust. The long-term effects of human exposure to chemicals in the sediments, believed to be a legacy of the gasworks and to include petrochemicals, are unknown. Fish biologists descend in bathyspheres and submarines to the deepest oceanic canyon, and trawlers scrape up odd saltwater nematodes and mollusks from the bottom sediments. Show More Sentences In accretionary prism models, the fact that the sediments are unlithified during deformation and burial indicates that accretion occurred soon after deposition. Folded sediments of pink-brown rock rise on either side, broken at intervals by dark basalt columns of solidified magma and occasional leopard caves. On Earth deposits of windblown sediments can be hundreds of meters thick. In the section on glacial sediments, Figure G12 takes half a page to show a braided river emanating from a glacier terminus that is not even clearly visible in the picture. These sediments are often bioturbated by an infauna that lived in them. The sediments recovered are of Early Pleistocene to Late Pliocene age. Dated marine and terrestrial sediments allow estimation of the timing of wind gap formation and rates of lateral propagation of the South Alkyonides Fault. Also mixed in the melange are sandy limestone and serpentine, as well as sediments that eroded off a precursor of our present Sierra Nevada Range. Pelagic biogenic sediments consist of the fine-grained skeletal debris of marine planktonic and benthonic organisms. Their research on carbonate-rich sediments in which the dinosaurs were buried suggests the area was near or in a spring, and that there were at least two mass die-offs. Limestones of the underlying carbonate ramp sediments are primarily packstones containing numerous foraminiferans but they do not contain decapod fossils. The sediments of the Grensen Formation are barren of all organic material and hence must be dated using radiometric and petrographic evidence alone. Water-transported sediments formed alluvial fan deposits that were laid down on essentially flat-lying volcanic flows by streams flowing toward the center of the rift basin. In glacial terrains coarse-grained, so-called Gilbert-type deltas of gravels and sands are common, and these pass in deeper water into varved sediments. If the mafic sheets were effusive and associated with primary volcaniclastic rocks, they should have contributed detritus to any immediately overlying sediments. The nine-foot long boulder, deeply veined with coloured sandstone sediments, has been cut into three four-inch thick slabs using massive diamond-toothed saws. If Apatosaurus and Diplodocus were both low browsers, what potential advantages would be incurred from robust or gracile humeri and femora if walking on wet sediments? Mud volcanoes are an important global mechanism for degassing deeply buried sediments and it has been estimated that several thousand occur globally. Microplastics have been discovered widely distributed across the bottom of the St. Lawrence River, the first time such pollutants have been found in freshwater sediments. Higher vapour pressures would be generated in sediments of low permeability, such as mudstones, which would account for sills being more commonly found in shale and greywacke. Show More Sentences The thickness of the Jurassic and Cretaceous cover sediments is relatively thin and the Variscan was the last major erogenic event to have affected the region. He developed a means of inferring marine paleotemperatures over geologic time by measuring the oxygen isotope ratios of carbonates in marine sediments. In addition, modern and Holocene sediments were collected from an embayment fill succession, comprising a series of relict foredunes at Longbeach, Guichen Bay. The present study was conducted entirely in U2 plutonic rocks, which, in the Bonifacio area, are locally covered by Miocene transgressive marine sediments. In both areas, the volcanic rocks are intercalated with sedimentary units and the onset of basin development is marked by deposition of elastic sediments. Lower Bathonian sediments were either never deposited or were eroded away. Recently a paleoecologist at the University of New South Wales studied charcoal in lake sediments at Jibbon Lagoon in Royal National Park, just south of Sydney. Water flow in the rivers decreased when the region's climate changed about 5,000 years ago and wind began to winnow the river delta's dried sediments. The holotype has a lower, flat band along the outer margins of the calyx and, as it is interiorly filled with sediments, shows considerable relief in the middle part. The late Jurassic, Cretaceous and Cenozoic sedimentary record from northern Chile is dominated entirely by sediments deposited under an arid to semiarid climate. Surficial sediments on Banquereau consist of well-sorted medium-grained sands. Such a chemolithoheterotrophic lifestyle was in agreement with the in situ environment of the sediments of the Atlantis II Deep. As along the eastern United States, continental shelves commonly acquire a prism of sediments as the continental margin downflexes. Recent research of sediments in Alaska indicates mammoths survived on the American mainland until 10,000 years ago. Burrowing bivalves are infauna that filter-feed from within seafloor sediments. When I am in my isness, thoroughly purged of all intellectual sediments, I have my freedom in its primary sense. In between the Tertiary rocks of the north, and the relatively new sediments along the coast, is a vast belt known as the Pleistocene Terraces. This suggests that London's pollution affects the spatial distribution of natural carbon in the river sediments. The Old Red Sandstone and the contemporary volcanics and marine sediments found in Devon originated from these processes. Later, river deltas formed and the sediments deposited were colonised by swamps and rain forest. Show More Sentences The uplifted areas were then eroded, and further sediments, such as the London Clay, were deposited over southern England. Vast quantities of these remains settled to sea or lake bottoms, mixing with sediments and being buried under anoxic conditions. Limy muds accumulated there as sediments, and entombed the remains of the animals living on the sea-floor. All lakes are temporary over geologic time scales, as they will slowly fill in with sediments or spill out of the basin containing them. The paragenesis of organic matter, phosphorus and uranium in marine sediments. Finally, their sediments contain enormous quantities of geologic and paleontologic information concerning past environments. Bedrock rivers form when the river downcuts through the modern sediments and into the underlying bedrock. The coarse sediments, gravel, and sand, generated and moved by rivers are extensively used in construction. As the water that rises from the ablation zone moves away from the glacier, it carries fine eroded sediments with it. Some kames form when meltwater deposits sediments through openings in the interior of the ice. The principle of original horizontality states that the deposition of sediments occurs as essentially horizontal beds. Fossil spores from land plants have been identified in uppermost Ordovician sediments. Estuaries are affected by events far upstream, and concentrate materials such as pollutants and sediments. These plants are terrestrial in origin and are essential to the stability of the salt marsh in trapping and binding sediments. It is an important process in delivering sediments, nutrients and plant water supply to the marsh. Lake bed sediments that have not solidified into rock can be used to determine past climatic conditions. Any depression in a marine environment where sediments accumulate over time is known as a sediment trap. Nephrops norvegicus adults prefer to inhabit muddy seabed sediments, with more than 40 percent silt and clay. Evaporites are considered sedimentary rocks and are formed by chemical sediments. An unconformity represents time during which no sediments were preserved in a region. Show More Sentences In general, the sediments that generate natural gas are buried deeper and at higher temperatures than those that contain oil. Significant deposits of methane clathrate have been found under sediments on the ocean floors of Earth at large depths. Chalk is not easily consolidated and the Chalk Group still consists of loose sediments in many places. Subsequently marine sediments burried old surfaces preserving the rocky shores and hilly terrain of the day. The natural Rhine originally branched into at least two arms and formed small islands by precipitating sediments. These moraines are composed of supraglacial sediments from the ice surface. The impact of waves and currents, carrying away sediments, is slowly changing the layout of the islands. Floodplains generally contain unconsolidated sediments, often extending below the bed of the stream. Supposed relics of the town have been found in the Wadden Sea, but shifting sediments make it hard to preserve them. It was introduced by Jules Desnoyers in 1829 for sediments of France's Seine Basin that seemed clearly to be younger than Tertiary Period rocks. Bottom trawling on soft bottoms also stirs up bottom sediments and loading suspended solids into the water column. In particular, trawling can directly kill coral reefs by breaking them up and burying them in sediments. Biogenic gas is created by methanogenic organisms in marshes, bogs, landfills, and shallow sediments. Dating the site has instead been based upon stratigraphy, palaeomagnetism, and the evidence of fossil flora and fauna in the sediments. The exact date of the sediments that contained the footprints has not yet been determined. Marine seashells found in Lake Ontario sediments imply a similar event in prehistoric times. The basin migrates with the orogenic front and early deposited foreland basin sediments become progressively involved in folding and thrusting. They form the basement on which the Torridonian and Moine Supergroup sediments were deposited. Instabilities in such sediments can result in the deposited material to slump, producing fissures and folding. Apart from continental sediments, rift basins normally also have part of their infill consisting of volcanic deposits. Show More Sentences In sag basins, the extra weight of the newly deposited sediments is enough to keep the subsidence going in a vicious circle. These represent periods where no new sediments were laid down, or when earlier sedimentary layers were raised above sea level and eroded away. The composition of sediments provides us with clues as to the original rock. The Tikiguania remains may instead be late Tertiary or Quaternary in age, having been washed into much older Triassic sediments. Organic chemical pollution contained in sediments of the Clyde estuary have been evaluated by British Geological Survey. Amphipods are abundant in soft sediments, eating a range of items, from algae to other animals. The Antarctic Peninsula was formed by uplift and metamorphism of sea bed sediments during the late Paleozoic and the early Mesozoic eras. Exposed bedrock surfaces, coarse sediments and local sand dunes attest to the strong bottom current conditions at the present time. Space for these sediments is called accommodation and is due to subsidence of especially the transitional crust. The accumulation of sediments above the subsiding transitional crust and lithosphere further depresses the transitional crust. This ridge traps sediments, thus allowing for thick sequences to accumulate. If the flux of sediments is high, material transfers from the subducting plate to the overriding plate. As continents approach each other, the trench can fill with continental sediments and become shallower. Most of this water is trapped in pores and fractures in the upper lithosphere and sediments of the subducting plate. The existence of such microcontinents is speculative, however, since their remains tend to be covered by younger layers of lava and sediments. The provenance of ocean sediments can be determined by analysing terrigenous strontium isotope ratios in deep ocean cores. Sediments underlying the Agulhas Current and Return Current have significantly higher ratios than surrounding sediments. Reversals also provide the basis for magnetostratigraphy, a way of dating rocks and sediments. The External Zone, located on the outer side of the arc, is mostly made of sediments deposited on the passive margins of Africa and Iberia. Synclines along the coast of the southern Cape contains sediments from the Bokkveld Group. Show More Sentences In the western part, the sediments are dammed by basement ridges, but, in the eastern part, they have spread into the Transkei Basin. The diamictite sediments that were laid down by these glaciers, or in glacial lakes, are known as the Pakhuis and Cederberg Formations. This is in marked contrast to the predominantly sandy sediments of the Table Mountain Group. The Witteberg Group is truncated by the overlying Dwyka sediments of glacial origin. The sediments also acquire depositional remanent magnetization which allows them to be correlated with earth's geomagnetic reversals. The extinct pine species Pinus matthewsii has been described from Pliocene sediments in the Yukon areas of the refugium. Plastics were found as microfibres in core samples drilled from sediments at the bottom of the deep ocean. Those sediments that instead moved south created the islands and shoals of Monomoy. A related issue is the methane clathrate reservoirs found under sediments on the ocean floors. Hypoxia can occur throughout the water column and also at high altitudes as well as near sediments on the bottom. The sediments that make up a tombolo are coarser towards the bottom and finer towards the surface. A small piece of land, such as an island, can change the way that waves move, leading to different deposition of sediments. Subfossils are often found in depositionary environments, such as lake sediments, oceanic sediments, and soils. When fine sediments are delivered into the calm waters of these glacial lake basins away from the shoreline, they settle to the lake bed. The stream gradient becomes nearly flat, and lateral deposition of sediments becomes important as the stream meanders across the valley floor. Mass movement is the downward and outward movement of rock and sediments on a sloped surface, mainly due to the force of gravity. It uses evidence from ice sheets, tree rings, sediments, coral, and rocks to determine the past state of the climate. In peat bog sediments, the Boreal is also recognized by its characteristic pollen zone. These sediments then provide an anaerobic environment which protects from further degradation. The sediments of the Sahara overlie an ancient plateau of crystalline rock, some of which is more than four billion years old. Find more words! 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What is the opposite of sediments? Words that rhyme with sediments What is the adverb for sediments? What is the adjective for sediments? What is the noun for sediments? Use our Sentence Generator Nearby Words sedimentology sedimentologist sedimentological sedimentologic sedimented sedimentation sediments of sedition seditionary seditionist seditious Sedona 9-letter Words Starting With s se sed sedi sedim sedime sedimen sediment