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Paleontological, paleobotanical, and lithological evidence suggests that the North Pole was in the area of the mouth of the Lena River during the Permian. Paleomagnetic data are less unequivocal. The boreal climatic realm occupied an area to 60 °N paleolatitude. The Permian climate was unstable, being coldest when the sea was frozen, i.e. during the Asselian and Kazanian, and warmest during the Kungurian-Ufimian and Tatarian.
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