The following five timelines show the geologic time scale to scale. The first shows the entire time from the formation of Earth to the present, but this gives little space for the most recent eon.

Oct 5, 2021 · Geologic time scale showing the geologic eons, eras, periods, epochs, and associated dates in millions of years ago (MYA).

Dec 1, 2025 · Geologic time, the extensive interval of time occupied by the geologic history of Earth. Formal geologic time begins with the Archean Eon (4.0 billion to 2.5 billion years ago) …

Geologists have divided Earth's history into a series of time intervals. These time intervals are not equal in length like the hours in a day. Instead the time intervals are variable in length. This is …

Feb 13, 2023 · The answer is the geologic time scale, a system that divides Earth’s history into eons, eras, periods, and epochs. It’s the timeline that connects rocks to time — and time to life.

An overview of the geologic time scale and the principles that underpin it. It is maintained by the International Commission on Stratigraphy and is structured hierarchically, divided into eons, …

Rise of civilization and agriculture. Extinction of large mammals in northern hemisphere. Modern humans appear. Four major glaciations cause rapid shifts in ecological communities. …

The geological time scale is a way that geoscientists assign relative age names to events and rocks, separating major events in Earth’s history based on significant changes as recorded in …

At GSA you'll find the resources, confidence, and connections you need to reach fulfilling new heights in your geoscience career.

Jan 11, 2025 · Learn about the geologic time scale or GTS. Discover what it is, how it is divided, and the characteristics of each time period.