A Note on Late Cretaceous Fish Taxa Recovered from Stream Gravels at Site AGr-43 in Greene County, Alabama

April 2013
Bulletin of the Alabama Museum of Natural History;Apr2013, Vol. 31 Issue 1, p84
Academic Journal
AGr-43 is a fossil site located within a stream in central Greene County, Alabama that is bounded by the Black Warrior River to the east and the Tombigbee River to the west. The stream bed consists of fossil-rich gravel that contains large quantities of Cretaceous elasmobranch and bony fish remains, reptile and invertebrate remains, as well as carbonate and siliciclastic lithic fragments. Much of this material likely originates from the Tombigbee Sand Member of the Eutaw Formation (late Santonian to early Campanian), but some could be derived from the overlying Mooreville Chalk (late Santonian to early Campanian). Stream gravels were collected in bulk and later screened, picked, and sorted in the lab. Thus far, 28 Cretaceous fish taxa have been identified from these gravels, 22 of which are elasmobranchs and the remaining six are osteichthyans. Eleven of the specimens we discuss represent new published records for Alabama. These taxa include: Archaeolamna kopingensis, Anomoeodus barberi, Borodinopristis cf ackermani., Carcharias sp., Ischyrhiza aff. avonicola, Lonchidion sp., Meristodonoides sp., Micropycnodon sp.?, "Pseudohypolophus" ellipsis, Squalicorax aff. yangaensis, and Texatrygon sp. Furthermore, the identification of Chiloscyllium sp. and Ischyrhiza aff. mira represent the first of these taxa reported from the Tombigbee Sand of Alabama. The identification of these 28 taxa from site AGr-43 aids in our understanding of Late Cretaceous paleobiodiversity, biostratigraphy, and paleobiogeography within the Mississippi Embayment and Western Interior Seaway.


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