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 ...

Abrupt climate change at the end of the Ordovician Period (~450-440 million years ago) caused the second largest mass extinction in Earth history, including the demise of the trilobite ...

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 ...

The fossil expert found love at first sight with trilobites.