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A vast area of northwest Pangea, extending from the Sverdrup Basin (Canadian Arctic) to the Barents Sea (Norwegian and Russian Arctic) was affected by a significant climatic cooling in Permian time. Warm tropical-like conditions prevailed during the Asselian and Sakmarian interval, cool to cold temperate-like conditions occurred during the Artinskian to Kazanian interval, and very cold, polar-like conditions were established during latest Permian time (undetermined Kazanian-Tatarian).

This climatic deterioration led to a significant shift in the composition of biogenic sedjments. Asselian and Sakmarian shallow-water carbonates comprise abundant aragonite-secreted skeletal and non-skeletal elements (ooid, cement) dominated by abundant green algae...

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