Prehistoric time line, geologic time scale, photos, facts, maps, and more from National Geographic.

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 ...

Geologic Time is a crucial concept to understanding the history of the earth — including the evolution of life. Many different representations of the timeline have been created, and many approaches ...

A major, 7.5-magnitude earthquake struck in the South Atlantic Ocean on Thursday, according to the United States Geological Survey. The temblor happened at 10:16 p.m. Eastern, data from the agency ...

A light, 4.1-magnitude earthquake struck in the San Francisco Bay Area on Thursday, according to the United States Geological ...

Vol. 357, No. 1757, Astronomical (Milankovitch) Calibration of the Geological Time-Scale (Jul. 15, 1999), pp. 1735-1759 (25 pages) From the beginning of its history the Royal Society has devoted much ...

DG: I don’t know. To be honest, I haven’t been following this too closely. It’s really not that interesting to me whether or not it becomes formally adopted as part of the geological time scale.

In 1913, before he even earned his doctoral degree, he proposed the first geological time scale, based on the fairly recently discovered phenomenon of radioactivity.