Cobban, W. A., 1958, Late Cretaecous fossil zones of the Powder River Basin, Wyoming and Montana, 13th Annual Field Conference Guidebook of Wyoming Geological Association: p.114-119.
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Cobban, W. A., 1958, Late Cretaecous fossil zones of the Powder River Basin, Wyoming and Montana, 13th Annual Field Conference Guidebook of Wyoming Geological Association: p.114-119.