Faunas and Age of the Amsden Formation in Wyoming; and A Permian (Wolfcampian) Fauna of the Casper Formation of Southeastern Wyoming (1954)

Burk, C.A., and Pederson, S.L., 1954, Faunas and age of the Amsden Formation in Wyoming (Burk), p. 1–15, 2 pls.; and A Permian (Wolfcampian) fauna of the Casper Formation of southeastern Wyoming (Pederson), p. 17–21: Geological Survey of Wyoming [Wyoming State Geological Survey] Reprint 14. (Reprinted from Journal of Paleontology, v. 28, no. 1, January, 1954.)