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Geosciences 2016, 6(3), 41; doi:10.3390/geosciences6030041

Turtles From an Arkadelphia Formation—Midway Group Lag Deposit (Maastrichtian—Paleocene), Hot Spring County, Arkansas, USA

Department of Environmental Science, William Paterson University, 300 Pompton Road, Wayne, NJ 07470, USA
Doctoral Program in Earth and Environmental Science, City University of New York Graduate Center, 365 Fifth Ave, New York, NY 10016, USA
Department of Earth and Environmental Sciences, Brooklyn College, City University of New York, 2900 Bedford Avenue, Brooklyn, NY 11210, USA
Arkansas Highway and Transportation Department, Fayetteville, AR, USA
Author to whom correspondence should be addressed.
Academic Editor: Jesus Martinez-Frias
Received: 23 June 2016 / Revised: 18 August 2016 / Accepted: 6 September 2016 / Published: 14 September 2016
View Full-Text   |   Download PDF [9946 KB, uploaded 14 September 2016]   |  


The Arkadelphia Formation—Midway Group (Maastrichtian—Paleocene) contact near Malvern, Arkansas preserves a K-Pg boundary assemblage of turtle species consisting of skull, shell, and non-shell postcranial skeletal elements. The Malvern turtles are preserved within a coquina lag deposit that comprises the basalmost Midway Group and also contains an abundance of other reptiles, as well as chondrichthyans, osteichthyans, and invertebrates. This coquina lag deposit records a complex taphonomic history of exhumation and reburial of vertebrate skeletal elements along a dynamic ancestral shoreline in southwestern Arkansas during the late Cretaceous-early Paleocene. Based on stratigraphic occurrence, the Malvern turtle assemblage indicates that these marine reptiles were living at or near the time of the K-Pg mass extinction and represent some of the latest Cretaceous turtles yet recovered from the Gulf Coastal Plain of the United States. View Full-Text
Keywords: turtles; K-Pg boundary section; Arkansas; Arkadelphia Formation; Midway Group turtles; K-Pg boundary section; Arkansas; Arkadelphia Formation; Midway Group

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Becker, M.A.; Maisch, H.M., IV; Chamberlain, J.A., Jr. Turtles From an Arkadelphia Formation—Midway Group Lag Deposit (Maastrichtian—Paleocene), Hot Spring County, Arkansas, USA. Geosciences 2016, 6, 41.

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