Understanding the geologic time scale and how to organize Earth’s history into a coherent timeline. MS-LS4-1: Analyze and interpret data for patterns in the fossil record that document the existence, ...

Geologists and paleontologists have long defined the geological time scale primarily based on major disruptions to life on Earth. Eras, periods, and epochs, particularly their boundaries, were ...

It’s just as well conditions like this are not common, or 18th-century geologists might have never made sense of Earth's ...

Geologists categorize time by looking at changes they see in the earth’s rock or sediment layers. Take the very dramatic example of the end of the Mesozoic era, when dinosaurs went extinct.

“A myriad of geological signals reflect this fact.” The Anthropocene issue has polarized scientists in a way that few issues in the history of the geological time scale ever have.

During the Cenozoic era, warmer oceans harbored more species with similar functional roles, according to a new study, which reveals how ocean temperature shapes biodiversity and biogeographic ...