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Journal of Paleontology; January 1966; v. 40; no. 1; p. 199-203
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New Upper Cretaceous ammonite, Protexanites thompsoni, from California

David L. Jones

Protexanites thompsoni Jones n. sp. from the Upper Cretaceous Funks Formation of Kirby (1943) in California has an early trituberculate stage and a later quadrituberculate stage, both characteristic of Protexanites; however, at a large diameter a pentatuberculate stage characteristic of Texanites appears. The suggested geologic age of this new species is late Coniacian or early Santonian.

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