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The AAPG/Datapages Combined Publications Database

GCAGS Transactions

Abstract


Gulf Coast Association of Geological Societies Transactions
Vol. 44 (1994), Pages 675-680

Fossil Vertebrates from the Castor Creek Member, Fleming Formation, Western Louisiana

Judith A. Schiebout

ABSTRACT

The first Miocene terrestrial vertebrate fauna from Louisiana has been recovered from exposures within Fort Polk in central western Louisiana. Remains of eight orders of mammals, including insectivores, rodents, perissodactyls, artiodactyls, and proboscideans, as well as crocodile and fish remains, have been recovered. Small vertebrate teeth are recovered from several conglomeratic layers in the Castor Creek Member of the Fleming Formation, and isolated bones and teeth of sheep-sized to horse-sized mammals are found in both the conglomerates and the surrounding nodule-rich mudstones. Nodules winnowed from the mudstone formed the layers of conglomerate. Small, resistant vertebrate remains from the normal accumulation on the land surface were concentrated and incorporated in them. After dissolution in dilute acetic acid and screening, the rocks yield a diverse fauna of terrestrial microvertebrates, particularly rodent teeth. Fossils found so far indicate an early late Barstovian Land Mammal Age.


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