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Divisions of geologic time (Bookmark)

U.S. Geological Survey
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Abstract

Description This bookmark presents information that is widely sought by educators and students. Version 3.0 of this bookmark is updated according to chapter C of U.S. Geological Survey Professional Paper 1879–1. The bookmark contains names of geologic time periods and boundary age estimates ratified by the International Commission of Stratigraphy in 2023.

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U.S. Geological Survey. 2012-05-03. Divisions of geologic time (Bookmark). https://doi.org/10.3133/gip141

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