Precambrian environment - AgnosticWeb.com

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, 02:54 PM
- Precambrian environment David Turell 2013-05-23, 08:29 PM
  - Precambrian environment dhw 2013-05-24, 11:52 AM
    - Precambrian environment David Turell 2013-05-24, 02:15 PM
      - Precambrian environment dhw 2013-05-25, 10:36 AM
        
        Precambrian environment David Turell 2013-05-28, 01:47 AM
        
        Precambrian environment David Turell 2013-10-28, 02:26 PM
        
        Precambrian environment dhw 2013-10-29, 07:48 PM
        
        Precambrian environment David Turell 2013-10-29, 09:46 PM
        
        Precambrian environment dhw 2013-10-30, 06:58 PM
        
        Precambrian environment David Turell 2013-10-31, 05:32 PM
        
        Precambrian environment dhw 2013-11-01, 12:53 PM
        
        Precambrian environment David Turell 2013-11-01, 02:56 PM
        
        Precambrian environment dhw 2013-11-02, 08:09 PM
        
        Precambrian environment David Turell 2013-11-03, 01:08 AM
        
        Precambrian environment David Turell 2013-11-03, 01:09 AM
        
        Precambrian environment David Turell 2015-08-05, 01:39 PM
        
        Precambrian environment: rangeomorphs David Turell 2015-08-05, 09:15 PM