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The pre-Pliocene Tennessee River and its bearing on crawfish distribution (Decapoda: Cambaridae)


, : The pre-Pliocene Tennessee River and its bearing on crawfish distribution (Decapoda: Cambaridae). Brimleyana, 123-146 No. 12

Recent demand for fossil fuels has provided opportunities for extensive and detailed examination of surface and subsurface unfossiliferous clastic deposits of the Coastal Plain of the Gulf of Mexico. Among the new discoveries is an ancient outlet directly into the Gulf for the upper Tennessee River USA more than once during mid- and late Tertiary times. Also discovered is evidence that the intrusion of the Mississippi Embayment apparently occurred much later than implied by surface outcrops in Mississippi and Alabama. Many Cambaridae distribution patterns show close association with these Tertiary deposits; included are Cambarellus, Fallicambarus, Faxonella, Hobbseus, Procambarus (Acucauda), P. (Girardiella), P. (Leconticambarus), P. (Pennides), and P. (Scapulicambarus). Some possibile interpretations related to these distributions are discussed, as is the pattern of Orconectes and Cambarus invasion. Much detailed study is badly needed, and potentially fruitful areas for investigation are indicated.

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