– Rare Earth Element Signatures of Fossil Vertebrates Compared with Lithostratigraphic Subdivisions of the Upper Cretaceous Pierre Shale, Central South Dakota Author(s): Doreena Patrick, D.E. Grandstaff, James E. Martin, and D.C. Parris Year: 2002 Volume: 81 Pages: 161-179 | South Dakota Academy of Science

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