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The AAPG/Datapages Combined Publications Database

Earth Science Bulletin (WGA)

Abstract


Earth Science Bulletin
Vol. 8 (1975), No. 4. (December), Pages 17-26

New Pelecypod Species from the Lower Cretaceous Near Kerrville, Texas

William R. Pampe

Abstract

Three new pelecypods from the Lower Cretaceous, Ceratomya kerrvillensis, Gresslya sp. A, and Pleuromya ingramensis are described from the Basal Nodular Member of the Fort Terrett Formation (Fredericksburg Group) near Kerrville, Texas. All of the specimens are internal molds. Fillings of extremely deep anterior muscle scars produced a distinctive protrusion on the molds of Ceratomya and Gresslya. A variation in the overall dimensions of Ceratomya suggest the possibility of several subspecies. A raised posterodorsal margin along the hinge line and pronounced grooves along the dorsal side are characteristic of the species of Pleuromya. This is the first identified record of these genera in North America.


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