South-Central Section - 42nd Annual Meeting (30 March - 1 April, 2008)
Paper No. 6-3
Presentation Time: 1:40 PM-2:00 PM

REVIEW OF VERTEBRATE DIVERSITY IN THE COON CREEK FORMATION LAGERSTÄTTE (LATE CRETACEOUS) OF WESTERN TENNESSEE

GIBSON, Michael A., Geology, Geography, Physics, University of Tennessee at Martin, 215 Johnson EPS Bldg, Martin, TN 38238, mgibson@utm.edu, STRINGER, Gary L., Department of Geosciences, University of Louisiana Monroe, Monroe, LA 71209, BELL, Gordon L., Guadalupe Mountains National Park, HC 60 Box 400, Salt Flat, TX 79847, LANGSTON, Wann Jr, Department of Geological Sciences, University of Texas Austin, School of Geosciences, Austin, TX 78712, MANNING, Earl, Department of Geology, Tulane University, New Orleans, LA 70118, and HARRELL, Lynn, Department of Geology, South Dakota School Mines, Rapid City, 57701

The Coon Creek Formation (terminal Campanian – Early Maastrictian) Lagerstätte is internationally recognized for its abundant and diverse invertebrates, especially mollusks and decapod crustaceans; however, the vertebrate fauna has received less attention until recently. The Coon Creek consists of a two predominant lithofacies. A lower sequence of micaceous, glauconitic, clayey-sand and sandy-clay beds contains the classic Coon Creek Fauna dominated by invertebrates. The overlying lithofacies is a dark, micaceous, shale dominated by trace fossils, gastropods and a wide variety of vertebrates. Six shark taxa include Heterodontus sp., Squatina hassei, Odontaspis serratus, Scapanorhynchus r. texanus, Otodus appendiculatus, and Squalicorax p. pristodontus, three rays (Ischyrhiza m. mira, Brachyrhizodus wichitaensis?, and Rhombodus binkhorsti). Chimaeroids include Ischyodus bifurcatus and Edaphodon sp. Turtles are represented by Bothremys cooki and Toxochelys latiremis. As many as five mosasaur taxa occur belong to Prognathodon overton, the only record of this taxon outside of the Western Interior, Plioplatecarpus depressus, Halisaurus platyspondylus, Globidens dakotensis, and Mosasaurus hoffmannii. Other marine reptiles include the marine crocodilian Eothoracosaurus mississippiensis and the plesiosaur Cimoliasaurus magnus. Flying reptiles are represented by a newly found azhdarchid pterosaur. A single hadrosaur tooth represents terrestrial taxa. Fish taxa are represented by teeth and bone of Hadrodus priscus, Anomoeodus robustus, Saurodon leanus, Pachyrhizodus, Enchodus (2 sp), Stratodus apicalis, Hoploberyx insculptus, and Cylindracanthus cretaceus. Pertinent information on the Coon Creek vertebrates has also been obtained through fish otoliths or earstones, which are part of the acoustico-lateralis system. Ten actinopterygians representing at least nine families have been identified. Otoliths add an albulid (bonefish), a pterothrissid (bonefish), a congrid (conger eel), an ariid (sea catfish), a chlorophthalmid (greeneyes), a trachichthyid (roughies), two apogonids (cardinal fishes), a pempherid (sweepers), and a perciform to the assemblage.

South-Central Section - 42nd Annual Meeting (30 March - 1 April, 2008)
Session No. 6
Marine Vertebrate Faunas of the Gulf Coastal Plain II
Hot Springs Convention Center: Room 203
1:00 PM-2:20 PM, Monday, 31 March 2008

Geological Society of America Abstracts with Programs, Vol. 40, No. 3, p. 8

© Copyright 2008 The Geological Society of America (GSA), all rights reserved. Permission is hereby granted to the author(s) of this abstract to reproduce and distribute it freely, for noncommercial purposes. Permission is hereby granted to any individual scientist to download a single copy of this electronic file and reproduce up to 20 paper copies for noncommercial purposes advancing science and education, including classroom use, providing all reproductions include the complete content shown here, including the author information. All other forms of reproduction and/or transmittal are prohibited without written permission from GSA Copyright Permissions.