Osteichthyans from the Fairpoint Member of the Fox Hills Formation (Maastrichtian), Meade County, South Dakota, USA |
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| Authors: | Martin A Becker John A Chamberlain Jr Albert J Robb Dennis O Terry Jr Matthew P Garb |
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| Institution: | aDepartment of Environmental Science, William Paterson University, Wayne, NJ 07470, USA;bDepartment of Geology, Brooklyn College and Doctoral Program in Earth and Environmental Sciences, CUNY Graduate Center, New York, NY 10016, USA;cExxonMobil Corporation, Houston, Texas 77060, USA;dDepartment of Earth and Environmental Science, Temple University, Philadelphia, PA 19122, USA |
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| Abstract: | The Fairpoint Member of the Fox Hills Formation (upper Maastrichtian) in Meade County, South Dakota, USA, contains an osteichthyan assemblage indicative of transitional to marine shoreface deposits. The fauna consists of: Lepisosteus sp., Paralbula casei, Cylindracanthus cf. C. ornatus, Enchodus gladiolus, Hadrodus sp., and indeterminate osteichthyans with probable affinities to the Siluriformes and Beryciformes. The Fairpoint fauna is of limited species diversity and in this character mirrors many other Upper Cretaceous North American osteichthyan assemblages. Comparison to Upper Cretaceous chondrichthyan diversity and consideration of the structure of Cretaceous marine food webs suggest that osteichthyans are strongly under-represented in the Upper Cretaceous of North America. The small size and poor preservation potential of many Upper Cretaceous North American osteichthyans probably account for much of this observed paucity. Fairpoint osteichthyans are members of families that survive the Cretaceous–Paleocene boundary extinction event. Some of these genera and families are still extant and occur in a wide array of modern fresh, brackish, and shallow marine environments. |
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| Keywords: | Maastrichtian Osteichthyans Fairpoint Member Fox Hills Formation South Dakota |
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