Sentences with phrase «from ancient sediments»

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.

Not exact matches

The sediments, which contain evidence of Inca farming including the remains of seeds and mites that feed on llama dung, come from Marcacocha, a small lake near Cuzco, Peru, at the heart of the ancient empire.

Walter mapped likely methane deposits across the region; quantified how much methane, formed when permafrost melts, is bubbling out of current lakes; and compared that with the amount emitted from methane - laden sediments taken from ancient frozen lakes.

To test that idea, they have studied ancient ocean sediments laid down during the Ediacaran and Cambrian periods, which together ran from about 635 million to 485 million years ago.

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.

Using ancient DNA, along with the remains of pollen, plants, and animals collected from lake sediments, a new study has an answer: about 12,600 years ago.

Researchers often reconstruct ancient climate from clues in sediment cores.

By analyzing the leaf wax from ancient marine sediments, the team determined the region's past rainfall patterns and also gathered clues about what types of plants were growing.

Not everything from St. Paul Island is muddy: The team collected vegetation to compare it with ancient pollen and other clues to the environment stored in the sediment cores to learn how the island has changed over time

An ancient record Assessing lake sediment cores from the region reaching 15,000 years into the past, a Montana State University team found whitebark pines more abundant despite higher summer temperatures and fire frequency than today.

To arrive at those conclusions, the researchers used sediment cores from Lake Towuti, an ancient lake on the island of Sulawesi in central Indonesia.

The probe from DeLong and Hinrichs, on the other hand, had worked right away: The Hydrate Ridge sediments were loaded with their methane eater, which is not a bacterium at all but a species of Archaea, an ancient group of microbes that diverged from bacteria billions of years ago and are as distinct from them now, genetically speaking, as humans are.

Sediment core samples drawn from Lake Titicaca, South America's largest freshwater lake, have revealed a 25,000 - year precipitation record that may rewrite the books on ancient climate.

Paleontologists sometimes build timelines from ancient ocean beds, where 100 million years of sediment layers are often stacked in one continuous sequence.

But the latest research into sulphur - producing algae, ancient ice cores, and sea sediments from the North Atlantic region could help climatologists

Warming and the seas — both on the rise Those ancient samples of sediment from 10 coastal wetlands in North Carolina provide some of the best evidence that sea - level rise closely follows warmer temperatures, Rahmstorf says.

Rocky lumps found eroding from ancient clay - rich sediments in Italy may be the first known fossils of ambergris, a fragrant and flammable substance produced in the intestines of sperm whales.

Allaby's team took four core samples of sediments from a section of the site littered with burnt hazelnut shells apparently left by the hunter - gatherers and subjected the samples to both radiocarbon dating and ancient DNA analysis.

Bones are the usual source of ancient human DNA, but last spring, scientists announced that they had managed to pick it up from cave sediments.

By analyzing the sediments, scientists can predict how much coral and algae were present on mesophotic reef environment, this new information has important implications from interpreting ancient reef environments found in fossils, where the abundance of diverse habitat forming species can not be analyzed visually.

Other animals from these ancient marine sediments include a number of exciting new discoveries: arthropods without skeletons, many sponges, a few shelled brachiopods and a single trilobite species.

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.

That's what scientists who study ancient humans will likely be doing following the revelation of a new technique that enables the recovery of hominin DNA directly from sediments without the need for fossils.

Lake sediment cores have been used to look at ancient biodiversity levels from 6 — 12.6 thousand years before present.

Formed some 60 million years ago, these concretions conglomerated from ancient seafloor sediments until shoreline erosion gradually unearthed them from the cliffs.

Updated from the ancient American reliquary art form, once used to mark the gravesites of slaves, the piece becomes a eulogy, an elegiac sermon rhapsodizing a lost youth and culture by manifesting its sentiments as the sediment of rescued memories.

The tools used can also be applied to better interpret sediment records from other marine systems, both modern and ancient, and can thereby aid in the assessment of the time scales of a possible decline into, and recovery from, wide - scale anoxia and euxinia.

in ancient sediments from a dinosaur civilization, but the details are lost to me.

This suggests that petroleums and other noncoaly organic matter in ancient sediments are derived from lipids, or at least from certain components of the lipid fraction.

From the University of California — Berkeley Deep sediments are unparalleled record of biotic changes over past 200,000 + years University of California, Berkeley, scientists are drilling into ancient sediments at the bottom of Northern California's Clear Lake for clues that could help them better predict how today's plants and animals will adapt to climate change...

Contributions from ancient C sources were twice as large in fine textured sediments.