Figure 23. Shallow-marine sandstone in upper part of Schrader Bluff Formation at Shivugak Bluff showing lag of marine shells in a hummocky cross-stratified facies. White ovals just beneath pen are likely Schaubcylindrichnus trace fossils. Photograph by D.W. Houseknecht.
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U.S. Department of the Interior, U.S. Geological Survey
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