Author: Cobban W.A.,
Title: Some Middle Cenomanian (Upper Cretaceous) Acanthoceratid Ammonites from the Western Interior of the United States- In folio, broch
Description: 1987. , pp. 60 with 13 pls. with facing captions, and 19 figs. Geological Survey Professional Paper 1445.

Keywords: shells fossil ammonites paleontology geology


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