Rex E. Crick
Contributor
LOCATION: Arlington, TX, United States
Professor of Earth and Environmental Sciences, University of Texas at Arlington, Arlington, Texas.
Primary Contributions (2)
Paleozoic Era, major interval of geologic time that began 538.8 million years ago with the Cambrian explosion, an extraordinary diversification of marine animals, and ended about 252 million years ago with the end-Permian extinction, the greatest extinction event in Earth history. The major…
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