Supplementary Figure from Olson's Extinction and the latitudinal biodiversity gradient of tetrapods in the Permian

Rank abundance distributions of the tetrapods from A) middle Wuchiapingian temperate Laurasian bin; B) middle Wuchiapingian temperate Gondwanan bin; C) late Changhsingian temperate Laurasian bin; D) late Changhsingian temperate Gondwanan bin.