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Due to volcano activity:-http://phys.org/news/2013-03-huge-widespread-volcanic-eruptions-triggered.html

Complete thread:

End-triassic extinction David Turell 2013-03-22, 03:54 PM
- End-triassic extinction Balance_Maintained 2013-03-23, 07:15 AM
  - End-triassic extinction: Problems with Dating Igneous Rock Balance_Maintained 2013-03-23, 09:20 AM
    - End-triassic extinction: Problems with Dating Igneous Rock David Turell 2013-03-23, 03:33 PM
      - End-triassic extinction: Problems with Dating Igneous Rock Balance_Maintained 2013-03-23, 06:58 PM
        
        End-triassic extinction: Problems with Dating Igneous Rock Balance_Maintained 2013-03-24, 05:36 AM