Abstract
Neogene radiolarian assemblage parameters were used on siliceous sediment samples from coastal California to reconstruct the California Current at three time planes (5, 8, and 10 Ma). Primary trends in diversity and abundance parameters of various components of the radiolarian assemblage were found in the east-west, or cross-current, direction. Secondary trends in the direction of current flow (north-south) were also exhibited. The oceanographic history of the boundary-current region was reconstructed from these trends within the radiolarian assemblage. Two significant features reflected by the radiolarian parameters were the California Current width and the degree of oceanographic convergence developed off Baja California. The California Current appears to have been narrower and closer to shore 8 and 10 Ma than 5 Ma, but the convergence off Baja appears to have been better developed 5 and 10 Ma than 8 Ma.
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