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The AAPG/Datapages Combined Publications Database
GCAGS Transactions
Abstract
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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