Divisions of Geologic Time (Bookmark)

General Information Product 141



This bookmark presents information that is widely sought by educators and students. This bookmark is adapted from the more detailed U.S. Geological Survey Fact Sheet 2018–3054, “Divisions of Geologic Time,” prepared by the U.S. Geological Survey Geologic Names Committee in cooperation with the Association of American State Geologists. The fact sheet and the bookmark contain names of geologic time periods and boundary age estimates ratified by the International Commission on Stratigraphy in 2018.

Suggested Citation

U.S. Geological Survey, 2016, Divisions of geologic time (ver. 2.0, March 2020): U.S. Geological Survey General Information Product 141, a bookmark, https://doi.org/10.3133/gip141.

ISSN: 2332-354X (online)

ISSN: 2332-3531 (print)

Publication type Report
Publication Subtype USGS Numbered Series
Title Divisions of geologic time (Bookmark)
Series title General Information Product
Series number 141
DOI 10.3133/gip141
Edition Version 2.0: March 2020; Version 1.0: May 2012
Year Published 2020
Language English
Publisher U.S. Geological Survey
Publisher location Reston, VA
Description Bookmark
Online Only (Y/N) N
Additional Online Files (Y/N) Y
Google Analytic Metrics Metrics page
Additional publication details