![Palaeogeographic map of the Permo-Triassic, showing the single supercontinent Pangaea, modelled climate belts, and the distributions of terrestrial tetrapods. Tetrapods were distributed worldwide before and after the PTME crisis, but moved 10–15° polewards as a result of tropical overheating. The shift north is documented, but the fossil record is not good enough to document the Southern Hemisphere action. Key climatic belts, oceans and land masses are indicated.](http://upload.wikimedia.org/wikipedia/commons/thumb/3/3d/Permian%E2%80%93Triassic_paleoclimate.jpg/800px-Permian%E2%80%93Triassic_paleoclimate.jpg)
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