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.
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 Subtype||USGS Numbered Series|
|Title||Divisions of geologic time (Bookmark)|
|Series title||General Information Product|
|Edition||Version 2.0: March 2020; Version 1.0: May 2012|
|Publisher||U.S. Geological Survey|
|Publisher location||Reston, VA|
|Online Only (Y/N)||N|
|Additional Online Files (Y/N)||Y|
|Google Analytic Metrics||Metrics page|