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Upper Cretaceous Seabee Formation, comprising organic rich shale with tephra (volcanic ash) interbeds, near Umiat along Colville River. This is part of the Brookian source-rock system. Photos courtesy of David Houseknecht
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Upper Cretaceous Seabee Formation, comprising organic rich shale with tephra (volcanic ash) interbeds, near Umiat along Colville River. This is part of the Brookian source-rock system. Photos courtesy of David Houseknecht