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Leg 65 of the Deep Sea Drilling Project (DSDP) recovered cores at four drilling sites: 482, 483, 484, and 485 (Fig. 1). Because the prime objective of the leg was to drill a deep hole into near-zero-age crust adjacent to the crest of the fast-spreading East Pacific Rise, only Neogene-age sediments were recovered. At Site 482, seven holes were drilled; the oldest sediments recovered contained Martini's (1971) Zone NN20/21 (indicated by the presence of Emiliania huxleyi and Gephyrocapsa oceanica and the absence of Pseudoemiliania lacunosa). Because of dilution of the turbiditic sediments, a differentiation of Zones NN20/21 was not possible. The oldest sediments recovered at Site 483 were late Pliocene {Discoaster brouweri, Zone NN18). At Sites 484 and 485 we encountered sediments of Zone NN19 (P. lacunosa Zone) in the lowest recovered sedimentary intervals. The positions of zonal boundaries in the sites are shown in Figure 2. The coccolith species encountered are listed in Table 1 and discussed below for each site.

Neogene Coccolith Stratigraphy, Gulf of California, Deep Sea Drilling Project Leg 65