Radiolarian Biostratigraphy of the Late Miocene in Baja California and the Tres Marías Islands, Mexico

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Abstract
A total of eight land-based sections were studied. Four sequences are from Baja California (San Felipe, El Cien, Tortugas Formation, Arroyo Tiburon and Cabo San Lucas-La Paz), two from the Tres Marias Islands (Arroyo Hondo and Maria Cleofas) and Experimental Mohole (the only offshore site). The radiolarian zones recognized were: Dorcadospyris alata, Diartus petterssoni, Didymocyrtis antepenultima, D. penultima and Stichocorys peregrina. This is based on the tropical zonation of Riedal and Sanfilippo (1978). However, the Didymocyrtis antepenultima Zone is the most important in most of the selected sections; it occurs between 10.1 and 7.8 Ma. The zones recognized were correlated with the cold-water radiolarian assemblages of Weaver et al. (1981) in southern California [USA]. This correlation appears best with the northern sections and Experimental Mohole.

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