Abstract

The discovery of new fossil localities in Baja California near La Misión has established a middle Miocene age for the Rosarito Beach Formation and a basis for the correlation of the marine and nonmarine stages of the middle Miocene. Diverse assemblages consisting of diatoms, radiolarians, foraminifers, mollusks, sharks, rays, bony fish, marine mammals, birds, and a camelid have been identified from beds within the Rosarito Beach Formation.

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