This is a study of Foraminifera and, to a limited extent, Ostracoda 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 purpose of the 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 is about 350 ft. in thickness.

On the basis of 113 species and subspecies of foraminifers and 14 species of ostracods recovered from 27 core samples, time-stratigraphic and biostratigraphic relations 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: (1) the Danville Landing beds, Mosley Hill Formation, Sandel Formation, and Nash 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 (1963, Ph.D dissert., L.S.U.) and the Mosley Hill, Sandel, and Nash Creek Formations are related to the "Cythereis" blanpiedi subzone introduced by Deboo; and (3) the Jacksonian-Vicksburgian and Eocene-Oligocene boundaries are considered to coincide with the boundary between the Danville Landing beds and the Mosley Hill Formation; this boundary can be recognized only on the basis of paleontologic evidence.

A systematic treatment of the species identified is not

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presented because all of those recovered from the sediments examined are described and illustrated in the literature.

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