Sentences with phrase «of mud deposits»

Washed and screened samples of mud deposits.

That plants like bryophytes influenced the formation of mud deposits long before roots appeared is a surprise, says geobiologist Woodward Fischer of Caltech who wrote a commentary about the study for the same issue of Science.

Not exact matches

At those outcrops, the researchers calculated the percent of mud rock in the overall deposit by measuring the thickness of the muddy layers compared with the thickness of layers containing larger grains such as sand.

Ancient riverbed deposits of mud rock — rocks containing bits of clay and silt smaller than grains of sand — began increasing around 458 million years ago, around the time that rootless plants became common across Earth, researchers say.

So geologists William McMahon and Neil Davies, both of the University of Cambridge, decided to look for when amounts of mud rock began increasing in 704 ancient river deposits from 3.5 billion to 300 million years ago.

Scientists analyzing the texture of the rocks deposited by the landslides say they were transported by liquid water, water ice, or mud.

Bay mud consists of thick deposits of soft, unconsolidated silty clay, which is saturated with water; these soil layers are situated at the bottom of certain estuaries, which are normally in temperate regions that have experienced cyclical glacial cycles.

«These include the sharp mud - over-peat contacts that are laterally continuous over 5 kilometers, changes in fossil foraminifera assemblages across the buried peat contacts, long - lasting submergence also derived from fossil foraminifera records, and radiocarbon ages of plant macrofossils taken from buried peat deposits that are consistent with other southern Cascadia earthquake chronologies derived from buried peat and tsunami deposits.»

And thanks to tidal rhythms, the mud deposited on top of this forest is layered, so years can be counted as with the rings of a tree.

Since sediment carried by Bayou Lafourche 1,200 to 600 years ago only contained about 20 percent sand, but an abundance of mud, the researchers suggest that land building can be maximized by gearing muddy diversions toward vegetated areas rather than to capture sandy deposits along the open waters of the Gulf of Mexico.

Not the least of the challenges is that marine hydrate deposits are located in ocean mud up to a kilometer below the seafloor.

The only way that significant amounts of this mud could have been deposited as sediment in the sea would be if the ice sheet had retreated inland and eroded these rocks, say the team.

At Neolithic sites such as Çatalhöyük in Turkey, for example, archaeologists have found evidence that wild cattle bones were deposited in the foundations of mud - brick houses; the bones may be the remains of neighborhood feasts to celebrate the building of new dwellings.

Katrin Monecke of Wellesley College and her colleagues were able to identify a layer of light brown organic - rich mud within the core, deposited between 1740 and 1810, as a part of an underwater landslide, possibly unleashed by the 1755 Cape Ann earthquake.

Mud's charisma lies in the wide eyes of his beholders, a couple of 14 - year - olds who come upon him hiding out from the law and other pursuers on a little island in the Mississippi River; his literal hideout is an abandoned boat nestled high in the branches of a tree, where it was deposited by a flood.

Japanese researchers estimate 16M tonnes of rare earth deposits in deep - sea mud off Japan; hundreds of years of supply

We drive back and stop at the parking lot of Leirhnjukur, a moss - covered lava field with mud pots, solfatars and lava rocks with sulphur deposits.

The caves form in limestone although there may be bands of shale or chert visible in the cave walls along with mud, sand and boulder deposits on the cave floor.

«Beneath Siberia's snow may lie geologic formations that hold vast deposits of fossil fuels, as well as mineral resources» as if they didn't have drills that get through ice and like Canada, prefer to work on ice than on mud.

These icy deposits of methane locked in frozen water occur widely in sub-sea muds, deep lake muds and permafrost.

The drill core penetrated 514 m of silts and silty clays (glacial deposits) punctuated by muds and episodic 0.02 — 1.2 m thick terrigenous sands (interglacial deposits) 22.

Driving a «truck or other vehicle whose wheels or tires deposit mud, dirt, sticky substances, litter or other material on any street or highway,» is illegal and could warrant a fine of up to $ 2,000, after a several warnings and other measures.

The claims settled by the company referred to damages to engine seizure due to the mud of water deposits, electrical fittings etc..

Mudslides which are proximately caused by the overflow of inland or tidal waters and are akin to a river or liquid and flowing mud on the surfaces of normally dry land areas including your residence, as when earth is carried by a current of water and deposited along the path of the current.