Figure 24. Upper part of Shivugak Bluff showing section that includes the contact between the Schrader Bluff Formation and the overlying Prince Creek Formation (yellow dashed line). The prominent sandstone shown in middle of photograph and underlying rocks are predominantly marine, whereas all overlying rocks are predominantly nonmarine; thus, the top of that sandstone represents the formation contact at this locality. The prominent marine sandstone shown in middle of photograph is approximately 25 ft thick, and the fluvial sandstone at top of bluff is approximately 40 ft thick. View to east with the Colville River in background. Photograph by D.W. Houseknecht.
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U.S. Department of the Interior, U.S. Geological Survey
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