Abstract
Vertebrates from the Fort Hays Limestone Member (uppermost Turonian?-Middle Coniacian) of the Upper Cretaceous Niobrara Chalk in Kansas are poorly known. Six selachian taxa from the member in Ellis County, Kansas, are described herein: Ptychodus mortoni, cf. Scapanorhynchus sp., Cretolamna appendiculata, Cretoxyrhina mantelli, Paranomotodon sp., and Squalicorax falcatus. These selachians probably occupied the highest positions in the food chain during the maximum invasion of the Niobrara sea. Because the gradationally overlying Smoky Hill Chalk contains a rich vertebrate fauna, including P. mortoni, C. appendiculata, C. mantelli, and S. falcatus, other fossil vertebrates may eventually be discovered in the Fort Hays Limestone.
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