|2012 GSA Annual Meeting in Charlotte|
|Paper No. 27-26|
|Presentation Time: 9:00 AM-6:30 PM|
PLESIOSAUR REMAINS FROM THE ARKADELPHIA FORMATION-MIDWAY GROUP CONTACT (MAASTRICHTIAN-PALEOCENE) HOT SPRING COUNTY, NEAR MALVERN, ARKANSAS
BECKER, Martin A., Department of Environmental Science, William Paterson University, Wayne, NJ 07470, MAISCH, Harry IV, Department of Geology, Brooklyn College, 2900 Bedford Avenue, Brooklyn, NY 11210, firstname.lastname@example.org, O'BRIEN, Andrew J., Environmental Science, William Paterson University, 300 Pompton Rd, Wayne, NJ 07470, and CHAMBERLAIN, John A. Jr, Department of Earth and Environmental Sciences, Brooklyn College, and Doctoral Program in Earth and Environmental Sciences, CUNY Graduate Center, New York, NY 10016|
The Arkadelphia Formation-Midway Group contact (Maastrichtian–Paleocene) near Malvern, Arkansas preserves one of the youngest plesiosaur assemblages yet reported from the Gulf Coastal Plain of the United States. The assemblage consists of three vertebrae, a pubis bone and two teeth recovered by scuba diving an outcrop along a meander bend of the Ouachita River. These plesiosaur remains are preserved in mollusk, coral and ammonoid coquina and may derive from a single individual achieving a total overall length of 10 meters. Taphonomic conditions under which this coquina was deposited indicate that plesiosaurs may have inhabited a shallow, biohermal patch reef environment in southwestern Arkansas where they preyed upon an abundance of ammonoids, bonyfish and chondrichthyans such as Placenticeras sp., Enchodus sp. and Serratolamna serrata. The Arkadelphia Formation-Midway Group plesiosaur assemblage extends the known geographic range of plesiosaurs in North America and indicates that these apex marine reptiles were living at, or near, the K–Pg mass extinction boundary in the region.
2012 GSA Annual Meeting in Charlotte
General Information for this Meeting
|Session No. 27--Booth# 113|
Paleontology: Descriptive Paleontology, Biogeography, and Biostratigraphy (Posters)
Charlotte Convention Center: Hall B
9:00 AM-6:30 PM, Sunday, 4 November 2012
Geological Society of America Abstracts with Programs, Vol. 44, No. 7, p. 91
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