Cobban W.A. & Scott G.R., - Multinodose scaphitid cephalopods from the lower part of the Pierre Shale and equivalent rocks in the conterminous United States

1964. In 4to, original wrappers, pp. 27 with 4 pls. and 5 figs. Geol. Surv. Prof. Pap., 483-E. Ex Library stamp but a very good copy. Three species of ammonites, assigned to the new genus Trachyscaphites, provide a means for the correlation of Upper Cretaceous strata between the Western Interior, the Gulf Coastal Plain, and Europe

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