Sentences with phrase «ancient sediments»

They had come to analyze ancient sediment layers, not to hunt dinosaurs.

And Professor Kent and his colleagues have been able to read evidence of this regular cycle in huge cores of rock drilled from a geological feature in the Petrified Forest National Park in Arizona, and rock cores from ancient sediments beneath New York and New Jersey.

The rocks surrounding the preserved tissues didn't contain the carbon - rich compounds, further suggesting the chemical remnants stem from preserved soft tissues and not ancient sediments, the team reports online today in Nature.

Samples from the site have been sent through for analysis using a new technique, called ancient sediment DNA analysis.

So Jonathan Bloch was shocked when a postdoc sent him photos of fossils he had dug up while exploring ancient sediments in the newly expanded Panama Canal: They were monkey teeth.

Similarly ancient sediments may be preserved in many regions formerly covered by Pleistocene ice sheets.

Scientists plumbing the depths of the central equatorial Pacific Ocean have found ancient sediments suggesting that one proposed way to mitigate climate warming — fertilizing the oceans with iron to produce more carbon - eating algae — may not necessarily work as envisioned.

«So it might take both dedicated and novel detection methods to find evidence of a truly short - lived event in ancient sediments.

Human prehistory is written in the record as anatomical and behavioural evidence — the fragments of bones and stones that are unearthed from ancient sediments.

Ice cores and ancient sediments can be gleaned for clues to weather and climate in the past.

Broad, pebbly rivers meandered through that valley, and their ancient sediments can still be found in these cliffs.

Most fossils preserve the physical remains of organisms and their structure; however, geologists and paleobiologists at the University of Missouri recently collaborated to study fossils that reveal the behaviors of predators preserved as traces in ancient sediments.

Over millions of years, the river and its tributaries have carved a fanlike rill of dramatic canyons out of the ancient sediments of the Mesa Verde tablelands, a maze of vertiginous stone walls.

Previous research, which typically relied on identifying and counting the grains of pollen trapped in ancient sediments, have suggested that most vegetation that graced the arctic tundra and steppe belonged to a class of plants called graminoids (which includes grasses, reeds, and sedges).

Ancient sediments that once resided on a lake bed and the ocean floor show sulfur isotope ratios unlike those found in other samples from the same time, calling into question accepted ideas about when the Earth's atmosphere began to contain oxygen, according to researchers from the U.S., Canada and Japan.

So it might take both dedicated and novel detection methods to find evidence of a truly short - lived event in ancient sediments.