General Information Product 141
This bookmark, designed for use with U.S. Geological Survey activities at the second USA Science and Engineering Festival (April 26–29, 2012), is adapted from the more detailed Fact Sheet 2010–3059 "Divisions of Geologic Time." The information that it presents is widely sought by educators and students.
First posted May 3, 2012
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U.S. Geological Survey, 2016, Divisions of geologic time (reprinted October 2016): U.S. Geological Survey General Information Product 141, a bookmark, https://dx.doi.org/10.3133/gip141.
ISSN 2332–3531 (print)
ISSN 2332–354X (online)