Late Jurassic and early Cretaceous sedimentary rocks in the southern Rocky Mountain region of Canada consist of three lithologic divisions, in ascending order: the Fernie Formation, the Kootenay Formation, and the Blairmore Group. The majority of rock types are sandstones and conglomerates composed of clastic mineral and rock fragments grouped into four general suites. These suites apparently originated from four sources: a metamorphic province, a Paleozoic sedimentary province, a Pennsylvanian-Permian volcanic province, and a lowermost Mesozoic sedimentary province.

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