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This chapter summarizes the biostratigraphic and magnetostratigraphic correlations from Leg 75 and highlights some of the problems of cross-correlation between fossil groups and the paleomagnetic record. Various microfossil groups, as well as the macrofossil Inoceramus, were studied and are discussed briefly here. For detailed reports, the interested reader is referred to specific chapters by Barron, Saltzman, and Price for Inoceramus; by Boersma for Pliocene foraminifers; by Keating and Herrero-Bervera for magnetostratigraphy; by McNulty for Cretaceous foraminifers; by Sancetta for Pleistocene and Pliocene diatoms; by Steinmetz and Stradner for Cenozoic calcareous nannofossils; and by Stradner and Steinmetz for Cretaceous calcareous nannofossils. Leg 75 occupied three sites in the Angola Basin and on the Walvis Ridge in the southeast Atlantic Ocean (Fig. 1). Cenozoic sediments were recovered at all three sites, and Cretaceous sediments were recovered in Hole 53OA. Only two of the eight holes were rotary-cored; the remainder were hydraulic piston cored. Site 530 is located in the southeastern corner of the Angola Basin in 4629 m of water. Three holes were drilled at Site 530. Hole 530 was drilled using a standard rotary coring assembly, but was terminated (115 m below seafloor) by technical failure. Hole 530A was drilled to a total depth of 1121 m using a standard rotary coring assembly. Hole 53OB was cored to a depth of 180 m subbottom using the hydraulic piston coring device. Site 531 is located in 1267 m of water on the eastern end of the Walvis Ridge. Two holes were attempted at the site, but in each case the bottom was found to be hard and could not be penetrated. Both cores yielded Holocene foraminiferal ooze. Site 532 is located in 1331 m of water on the eastern part of the Walvis Ridge in a trough with relatively thick sediment fill. Site 532 is close to Site 362 drilled on Leg 40. Three holes were hydraulically piston cored. Hole 532 yielded 61 cores reaching a total depth of 250.8 m.

Summary of Biostratigraphy and Magnetostratigraphy of Deep Sea Drilling Project Leg 75