The trilobites were such a well-adapted species that they were able to survive several geological time periods. Those time ...

Learn more about a time period marked by an intense burst of ... enemies and a framework for supporting bigger body sizes. Trilobites, like this perfectly preserved specimen at South Dakota's ...

The trilobite, an extinct marine arthropod vaguely resembling a horseshoe crab, inhabited the primordial seas that covered New England during the Cambrian period 500 million years ... The Avalon ...