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The Jurassic system in Saskatchewan is represented by four formations, herein described and named in ascending order, the Watrous, Gravelbourg, Shaunavon, and Vanguard formations. The Watrous formation is largely continental in nature, the overlying three formations are marine. Tentative correlations have been made with Jurassic formations in Montana and South Dakota. All formations overlap northward and westward onto the truncated surface of the Paleozoic, and are truncated northward from the International Boundarv by pre-Cretaceous erosion.

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