Nature
The Sulphur Mountain Formation is an Early to Middle Triassic geologic unit exposed along the western edge of the Western Canada Sedimentary Basin in western Alberta and northeastern British Columbia. Deposited in shallow marine settings on the continental shelf when North America was part of Pangaea, it preserves fossils and trace fossils from a crucial interval after the Permian–Triassic extinction, making it important for understanding the recovery of marine ecosystems. First described in 1945 by P.S. Warren and later recognized as a formation, it also has practical value: outcrops help researchers study the equivalent Montney Formation, and its Vega Member has been quarried near Canmore as Rundle Stone.
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Alberta · Canada