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| Sedimentary Outcrops, pg. 64 | ||
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| Evolution of Major Groups, pp. 66-67 | ||
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| Diverse Organisms, pp. 66-67 | ||
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| Major Sources and Sinks, pg. 70 | ||
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| Oxygen Levels, pg. 71 |
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Geiger Content by: David J. Bottjer/ Richard C. Deonier and Edward J. Rhodes Jr. Created 2.13.98 - Last updated 2.17.98 ©USC All Rights Reserved URL: http://www.usc.edu/dept/mda/180evolution |