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The Odanah Member of the Pierre Shale in southwestern Manitoba is a porcelanite of Late Cretaceous (Campanian) age that was deposited on the eastern platform area of the Western Interior Seaway.

Odanah sediments were derived from erosion of preexisting sediments in the Cordilleran areas to the west, from contemporaneous volcanism, and from accumulation of siliceous biogenic material.

The mineral assemblage of the Odanah is dominated by cristobalite (opal-CT) with lesser amounts of quartz, mixed layer clays, feldspar, and illite. Cristobalite, derived from the diagenesis of diatoms, radiolarians, and siliceous sponge spicules, occurs as cryptocrystalline cement, bladed crystals, and lepispheres. Diatoms...

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