The study of strata is called stratigraphy ... if an unidentified fossil is found in the same rock layer as an index fossil, the two species must have existed during the same period of time ...

The study of strata is called stratigraphy ... if an unidentified fossil is found in the same rock layer as an index fossil, the two species must have existed during the same period of time ...

Smith's colourful and sophisticated geological map was based on his astute observation that rock layers (strata) could be identified by the fossils they contain. He noticed that the layers always ...

According to a new study published in Proceedings of the National Academy of Sciences, an estimated five kilometers (3 miles) of rock strata were ... is so abrupt in the fossil record—geological ...

A team of paleontologists recently discovered that an ancient seascape known for its diverse assemblage of exceptionally ...

When fossil remains were found that were unlike ... He was the first to demonstrate that the different strata of rock in the Paris basin each had its own mammal fauna. Furthermore, he showed ...

A lower jaw fossil of a pinniped was found in strata dating back 18 million years as work got under way for a road improvement project. Subsequent excavations unearthed other remains from what is ...