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The AAPG/Datapages Combined Publications Database

AAPG Bulletin


Volume: 64 (1980)

Issue: 9. (September)

First Page: 1565

Last Page: 1566

Title: Late Paleocene Planktonic Foraminiferal Biostratigraphy of Tuscahoma Marls, Southwest Alabama: ABSTRACT

Author(s): Gary E. Oliver, Ernest A. Mancini

Article Type: Meeting abstract


Using vertical distribution of planktonic foraminifers

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contained in the marls associated with the Tuscahoma Sand of the Wilcox Group in southwest Alabama, most of the formation can be assigned to the two late Paleocene planktonic foraminiferal zones recognized worldwide. The occurrence of Planorotalites pseudomenardii (Bolli) in the unnamed lower marls places these beds in the Planorotalites pseudomenardii Range Zone. The Greggs Landing and Bells Landing Marl Members contain a diverse assemblage of planktonic foraminifers including, Morozovella velascoensis (Cushman), Morozovella acuta (Toulmin), and Morozovella aequa (Cushman & Renz). The presence of M. velascoensis and M. acuta and the absence of P. pseudomenardii put these marls in the latest Paleocene Morozovella velascoensis Interval Zone. The occurrence of Morozovella subbotina Morozova) and Pseudohastigerina wilcoxensis (Cushman & Ponton) in the Bashi Marl Member of the Hatchetigbee Formation place this marl in the earliest Eocene Morozovella subbotina Interval Zone. Based on planktonic vertical distribution in southwest Alabama, the Paleocene-Eocene boundary occurs above the top of the Bells Landing Marl Member of the Tuscahoma Sand and probably near the base of the Bashi Marl Member of the Hatchetigbee Formation.

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