At the beginning of the Tertiary period folding movements brought the San Rafael uplift into existence in the area of the old Central geosynclinal basin, but left a basin along the south margin and particularly near the landward apex. The basin as a whole will be referred to as the Santa Barbara embayment, the apical part as the Ventura Basin. These subprovinces, San Rafael uplift and Santa Barbara embayment (including Ventura Basin), persisted, though not without important changes, throughout the Cenozoic era. The San Rafael uplift was flooded, at least in large part, during each of the major Tertiary transgressions...

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