38-million-year-old fossil In this location, scientists from the University of Alberta found a specific snake fossil in rocks from the Oligocene epoch (Cenozoic era). The remains include four ...

Some 54 million years ago, this entire region of Oregon lay beneath the Pacific Ocean. Within the striated rock, scientists have found fossilized evidence of more than 2,200 plants and animals and of ...

Learn about the time period that took place 65 to 23 million years ago. 3 min read At the dawn of the Paleogene—the beginning of the Cenozoic era—dinosaurs, pterosaurs, and giant marine ...

The Places to See Fossils in Colorado poster features a map of Colorado color-coded to represent the respective geologic ages of rocks throughout the state (See the “Key to Ages of Colorado Rocks” in ...