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Middle Eocene through Quaternary sediments were recovered from the southern Angola Basin at Sites 519 to 523 during Leg 73 of the Deep Sea Drilling Project. Clearly defined magnetostratigraphic records and relatively well preserved faunas occur in the lower Pliocene sediments of Hole 519, upper Eocene to Oligocene sediments of Hole 522, and middle Eocene sediments of Hole 523. The apparently complete Oligocene sequence in Hole 522 is especially important for establishing a direct calibration of calcareous plankton biostratigraphy and magnetostratigraphy in a midlatitude deep sea section. The Miocene assemblages in Holes 520 and 521 demonstrate that Sphaeroidinellopsis subdehiscens, Globigerina druryi, and forms very similar to G. nepenthes range down to, and perhaps below, the base of the middle Miocene. Thus, the standard middle Miocene zonation of Blow (1969), which uses the successive first appearances of Sphaeroidinellopsis subdehiscens and Globigerina nepenthes to define Zone NI3, requires revision. A new midlatitude Oligocene zonation (OL1 to OL6) developed primarily from the faunal sequence of Hole 522 is proposed and correlated to standard zonations developed in tropical and other extra-tropical regions.

Middle Eocene through Quaternary Planktonic Foraminifers from the Southern Angola Basin: Deep Sea Drilling Project Leg 73