Abstract

Studies of depth-related benthic foraminiferal biofacies permit the construction of paleobathymetric maps of the La Honda and San Joaquin basins of central California. These maps support the hypothesis that the La Honda and San Joaquin basins were contiguous during the late Oligocene and early Miocene and subsequently were separated by about 320–330 km of right-lateral displacement on the San Andreas fault. Furthermore, these estimates of displacement support the notion that right-lateral slip occurred along the San Andreas fault during the early Miocene.

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