The phrase "ancient sediments" refers to layers of dirt, mud, or soil that have built up over a very long time. These layers can contain evidence of past life and geological changes, so studying them helps us understand Earth's history.
Sentences with «ancient sediments»
They had come to analyze ancient sediment layers, not to hunt dinosaurs. (discovermagazine.com)
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. (climatenewsnetwork.net)
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. (sciencemag.org)