Abstract

A well preserved molluscan fauna has been collected from previously undescribed Cretaceous rocks in the northwestern Sacramento Valley, California. The fossils occur in the Bald Hills formation, a 1,000 ft. to 1,900-ft. thick SE.-dipping conglomerate, graywacke, and mudstone unit which ranges in age from late Albian to late Cenomanian. The gastropod and cephalopod elements of this fauna number 32 species, 17 of which are new.

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