Geologic Time Online Edition
http://pubs.usgs.gov/gip/geotime/


This tutorial will help students learn and understand the concepts of geologic time and the age of the Earth. They will investigate the geologic time scale and learn about the use of index fossils and radiometric dating to determine the age of rock formations and fossils.

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Subject: Biology
Grade Level: High School (9-12), College Upper (15-16), College Lower (13-14)Keywords: Carbon dating, Stratigraphy, Radioactive decay, Isotope