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Cores 415-4 and 415-5 andCores416A-l and416A-2, from sites off the northwest coast of Africa (Figure 1), contain diverse Miocene coccoliths, diatoms, and silicoflagellates. All the cores contain silicoflagellate assemblages of the middleand lower-Miocene Corbisema triacantha Zone (Figure 2). One sample from the bottom of Core 415-5 may belong to a new Naviculopsis ponticula Zone. Coccoliths of the loweror middleMiocene Helicosphaera ampliaperta Zone occur in Cores 415-5 and 416A-2; the next higher Sphenolithus heteromorphus Zone occurs in Cores 415-4 and 416A-1. Diatom zones are not identified from the assemblages (Figure 3), but the presence of short-ranged Annellus californicus and Raphidodiscus marylandicus suggests a diatom correlation near the boundary between lower and middle Miocene (Andrews, 1974; Ryan et al., 1974; Schrader and Fenner, 1976).

Miocene Corbisema triacantha Zone Phytoplankton from Deep Sea Drilling Project Sites 415 and 416, off Northwest Africa