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GCAGS Transactions

Abstract


Gulf Coast Association of Geological Societies Transactions
Vol. 15 (1965), Pages 61-71

Biostratigraphy of the Vicksburgian Equivalent at Toledo Bend Dam Site, Louisiana and Texas(1)

Don R. Anderson (2)

ABSTRACT

Foraminiferida and, to a limited extent, ostracoda have been recovered from cores from five stratigraphic test holes drilled along the proposed site of Toledo Bend Dam in Sabine Parish, Louisiana, and Newton County, Texas. The purposed of this study was to compare faunules from that portion of the sediments in the test holes considered to be Jacksonian (Eocene) and Vicksburgian (Oligocene) with faunules reported from type sections in Mississippi and western Alabama. The section studied averaged about 350 feet in thickness.

On the basis of 113 species and subspecies of foraminifers and 14 species of ostracodes recovered from 27 core samples, time-stratigraphic and biostratigraphic relationships between the sediments in west-central Louisiana along the Sabine River and sediments from some classic outcrops of the Jacksonian and Vicksburgian in Mississippi and western Alabama are proposed as follows: (1) the Danville Landing beds, Mosley Hill Formation, Sandel Formation, and Previous HitNashNext Hit Creek Formation are considered to belong to the Spondylus dumosus zone introduced by Cheetham in 1957 for a series of beds in Florida and Alabama; (2) within the assemblage zone characterized by Spondylus dumosus, the Danville Landing beds are closely related or equivalent to the Cribrohantkenina "danvillensis" subzone as used by Deboo in 1963 (Ph.D. dissertation at Louisiana State University), and the Mosley Hill, Sandel, and Previous HitNashTop Creek Formations are related to the "Cythereis" blanpiedi subzone introduced by Deboo; (3) the Jacksonian-Vicksburgian boundary and the Eocene-Oligocene boundary are considered to be coincident with the boundary between the Danville Landing beds and the Mosley Hill Formation, which can only be recognized on the basis of paleontologic evidence.

A systematic treatment of the species identified is not presented because all of those recovered from the sediments examined are well described and illustrated in the literature.


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