Precambrian environment (Introduction)

by David Turell , Monday, October 28, 2013, 14:26 (4022 days ago) @ David Turell

There was lots of oxygen before the Cambrian explosion 2 billlion years ago. Why did it take until 540 million years ago to happen? No one knows.-http://www.sciencedaily.com/releases/2013/10/131018132205.htm

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Precambrian environment - David Turell, 2012-09-27, 15:54
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        Precambrian environment - David Turell, 2015-08-05, 14:39
        Precambrian environment: rangeomorphs - David Turell, 2015-08-05, 22:15

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Precambrian environment (Introduction)