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During Leg 24 of the Deep Sea Drilling Project, a total of eight sites was drilled in the western tropical Indian Ocean. Continuous coring and a high rate of recovery at most sites have provided an excellent basis for the study of low-latitude planktonic foraminiferal biostratigraphy in the Indian Ocean. This report should be considered preliminary, but the large amount of recovered material warrants much further study. Neogene planktonic foraminifera were recovered at all sites, but there are major variations in abundance and preservation within and between the sites. Three distinct geographic areas were drilled; the Gulf of Aden, the northwestern Somali Basin, and the Mascarene Plateau/ Central Indian Ridge/Chagos-Laccadive Ridge complex area (Figure 1, Table 1). The Gulf of Aden is a young and mobile region of intermediate depth bisected from east to west by Sheba Ridge, a seismically active zone which marks the spreading center (Matthews et al , 1967). Sheba Ridge is offset by several minor transform faults and near its eastern end by a linear north-northeast-trending cleft, the 5360 meter-deep Alula-Fartak Trench. Three sites were drilled in this region. Site 231 is located near the southern shore of the Gulf of Aden, 80 km off Somalia and Sites 232 and 233 were drilled on either side of the Alula-Fartak Trench. Site 232, on the western edge of the trench, lies northeast of the Sheba Ridge rift zone, whereas Site 233 on the eastern side is to the southwest of the rift. Site 231 reached igneous basement (approximately 13 m.y. old), whereas Sites 232 and 233 were terminated for technical reasons after reaching "acoustic basement," a massive quartzose sandstone at Site 232, and a diabase sill at Site 233. The sedimentary sequences, continuously cored, are similar at the three sites and consist of late Neogene hemipelagic nannofossil oozes which accumulated at a fast rate (44 to 75 m/m.y. average). Despite the shallow water depth at the sites, a significant degree of dissolution of planktonic foraminifera was found throughout the sections. The western Somali Basin is a magnetically quiet zone containing ponded sediments, 2-3 km thick, which appear similar in aspect on widely separated reflection profiles, with an acoustically transparent layer separating the upper and lower stratified (partly turbidite) sequence (Bunce et al., 1967). Two sites were drilled on either side of Chain TABLE 1 Location of DSDP Leg 24 Sites

Neogene Planktonic Foraminifera from the Gulf of Aden and the Western Tropical Indian Ocean, Deep Sea Drilling Project, Leg 24