Off the coast of Brazil, a scuba diver captured something remarkable on video: a wrasse fish gripped a mollusk in its mouth, ...

Ammonite shells are used today as index fossils, meaning they can help date other fossils that are found in the same layer of marine rock. These cephalopods make for ideal index fossils because ...

The oldest fossils are remains of marine ... bones, shells, or wood -- were preserved. Fossils can be formed in several ways. Buried bone and shell contain tiny air spaces into which water can ...