The beginning and end of each chunk of time in the geologic time scale is determined by when some species appeared or disappeared from the fossil record. When many species went extinct around the same ...

The system many scientists have settled on is the International Geologic Time Scale (laid out here in the International Chronostratigraphic Chart), which breaks geologic time into five units.From ...

Chart topper. On the newly revised geologic time scale, the Holocene Epoch — a time period stretching from the end of the last Ice Age 11,700 years ago to today — is divided into three named ages.

Anthropocene combines the Greek words for human and recent time period, to denote the period of time since human activity went global and we became an important geologic process in our own right ...

Geologists have added a new period to their official calendar of Earth's history - the first in 120 years. The Ediacaran Period covers some 50 million years of ancient time on our planet from 600 ...

Humanity has so reshaped the planet recently that a new geological time period should be devised, Dr. David Grinspoon says. Skip to main content. ... Spiraling timescale chart of life on Earth. Q: ...