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#326585
Tue 25 Aug 2015 03:50:PM
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Joined: Feb 2001
Posts: 381,903
Launch Director
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OP
Launch Director
Joined: Feb 2001
Posts: 381,903 |
Several Palaeozoic mass extinction events during the Ordovician and Silurian periods (ca. 485 to 420 to million years ago) shaped the evolution of life on our planet. Although some of these short-lived, periodic events were responsible for eradication of up to 85 percent of marine species, the exact kill-mechanism responsible for these crises remains poorly understood. Source: 415-million-year-old malformed foss...of the world's largest extinction events
David Cottle
UBB Owner & Administrator
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