USGS: Science Topics: geologic time scales

Science Topics

Geologic time scales

Named divisions of geologic time used to specify relationships among geologic units and structural features

Subtopics:
(none)

Results 1 - 7 of 7 listed alphabetically [list by similarity]

Compilation of various geologic time scales [More info]: Preliminary report comparing various geologic time scales. Text is HTML or plain text format, and colored compilation chart in Excel format.
Divisions of Geologic Time - Major Chronostratigraphic and Geochronologic Units [More info]: A summary of the divisions of geologic time intended to provide a consistent time scale to be used in communicating ages of geologic units in the United States.
Fossils, rocks, and time [More info]: Booklet describes how paleontologists use the identification of fossils to recognize rocks of the same or different ages.
Geologic time online edition [More info]: Booklet giving general explanations of geologic time, major divisions of geologic time, relative and radiometric time scales, index fossils, and the age of the earth.
Geologic time scale bookmark [More info]: This printable bookmark was designed for use with USGS activities at the 2nd USA Science and Engineering Festival, held April 26-29, 2012.
Geologic time scale chart [More info]: Chart of the geologic time scale with references.
Precambrian Time - The Story of the Early Earth [More info]: Explains what we know about the early history of the earth and how we study the deposits formed during that time to understand the formation of the earth and life.

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