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The Permo-Triassic Extinctions
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Lecture 22
4/22/98
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| | Today we examine the largest extinction event in the earth's history. |
| | The Permo-Triassic extinction is focused on the marine biosphere. |
| | Land plants and animals are less affected by the extinction. |
| | The causes for the extinction remain unclear. |
| Permo-Triassic Extinctions |
| | 90-95% of fossil organisms |
| | focused on marine organisms |
| | Number of marine families is halved |
| | extinctions focused at species level |
| | stratified, anoxic oceans |
| | sudden increases CO2 levels in shallow waters |
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