The Geologic Time Scale

Lyn Topinka, U.S. Geological Survey

This resource presents a table of the Geologic Time Scale. The time scale begins with a brief description of the Precambrian Era, and proceeds through the Cambrian Period starting 544 million years ago and concluding with the Holocene Epoch of today. The time periods are explained and include the dates, scientific names, historical descriptions, and common names. The table is organized by Era, Period or System, and Epoch or Series.

This resource originally cataloged at:


Resource Type: Scientific Resources:Overview/Reference Work
Grade Level: High School (9-12), Middle (6-8), Intermediate (3-5)
Topics: Biosphere, Time/Earth History