The cuticular structure of " Lepidopteris " is comparable to that of modern " Ginkgo ", which has been used to estimate past atmospheric carbon dioxide from its stomatal index.
2.
The cuticular structure of " Lepidopteris callipteroides " is comparable to that of modern " Ginkgo ", and has been used to estimate past atmospheric carbon dioxide of an astounding 7832 ppm from its stomatal index immediately following the largest Permian-Triassic extinction event.
3.
Because " Lepidopteris " and " Ginkgo " leaves in the same South African fossil quarries have the same stomatal index, the calibration for modern " Ginkgo " has been used to calculate carbon dioxide levels from Late Permian and Triassic " Lepidopteris " leaves.
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