Reston, VA – The U.S. Geological Survey (USGS) and the Association of American State Geologists (AASG) announced that they have developed an updated geologic time scale and color scheme for use in ...
Introduction -- Planetary time scale / Kenneth L. Tanaka and William K. Hartmann -- Precambrian / Martin J. Van Kranendonk, James Gehling, and Graham Shields -- Cambrian period / Shanchi Peng and ...
The time scale shows the expanse of time between the Permian-Triassic mass extinction and the less severe mass extinction that wiped out the dinosaurs. Disclaimer: AAAS and EurekAlert! are not ...
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