Title: ... The stratigraphic relations and paleontology of the "Hell creek beds", "Ceratops beds" and equivalents, and their reference to the FortUnion formation,
Authors: Knowlton, Frank Hall, 1860-1926.
Publisher: Washington acakedmy of sciences,
Year: 1909
Subjects: Geology West (U.S.); Geology, Stratigraphic; Geology, Stratigraphic