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High Plains escarpment of Tertiary rocks on the eastern flank of the Laramie Mountains near Chugwater Creek. Eocene White River mudstone and siltstone, beds are capped by coarse sandstone beds. An overlying gravelly sandstone unit, probably of the upper Oligocene Arikaree Formation lies above the White River beds. The Miocene Ogallala Formation of stacked conglomerate sheets caps the entire section.