USGS - science for a changing world

Science Topics

Maps, Imagery, and Publications Hazards Newsroom Education Jobs Partnerships Library About USGS Podcasts/RSS
You are here: Categories > Product types > Terminologies and classifications
Help
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 by similarity [list alphabetically]
PDF 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.
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.
PDF 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.
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.
Fossils, rocks, and time [More info]
Booklet describes how paleontologists use the identification of fossils to recognize rocks of the same or different ages.
PDF 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.
Alphabetical Index of Topics a b c d e f g h i j k l m n o p q r s t u v w x y z

Accessibility FOIA Privacy Policies and Notices

Take Pride in America logo USA.gov logo U.S. Department of the Interior | U.S. Geological Survey
URL: http://www.usgs.gov/science//science/science.php?term=1745&type=theme
Page Contact Information: Ask USGS