--> Abstract: Jacksonian-Vicksburgian Boundary in East-Central Gulf Coast Evaluated by Means of Ostracoda, by Herbert J. Howe; #90967 (1977).

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Abstract: Jacksonian-Vicksburgian Boundary in East-Central Gulf Coast Evaluated by Means of Ostracoda

Herbert J. Howe

The distribution of the Ostracoda from the Shubuta Clay and the Red Bluff Clay of the east-central Gulf Coast region has been analyzed in an attempt to evaluate the boundary between the Jacksonian and Vicksburgian Stages. Of 39 species in the Shubuta, at least seven continue into the overlying Red Bluff Clay. They are Alatacythere ivani Howe, Bairdia hiwanneensis Howe and Lea, Bythocypris gibsonensis Howe and Chambers, Cytherella hannai Howe and Lea, Digmocythere russelli (Howe and Lea), Echinocythereis jacksonensis Howe and Pyeatt, and Loxoconcha inflata Howe and Howe. Seven additional Red Bluff ostracods are direct evolutionary descendants of Shubuta species. Less than 50% of the Red Bluff ostracods show affinity with the underlying Shubuta fauna, whereas about 90% of t e Red Bluff species continue into the overlying Vicksburgian strata. Although the data demonstrate the transitional aspect of the Red Bluff fauna, they support the viewpoint that in eastern Mississippi and western Alabama the Jacksonian-Vicksburgian boundary should be placed at the base of the Red Bluff Clay.

AAPG Search and Discovery Article #90967©1977 GCAGS and GC Section SEPM 27th Annual Meeting, Austin, Texas