The present Ventura Basin (Fig. 36) is a small part of the crescent-shaped embayment lying to the east and south of the positive area (San Rafael uplift) that came into existence as a result of post-Cretaceous folding. The western end of the southern arm of the embayment is narrow, and is here called the Santa Barbara strait. It lay approximately in the position of the present Santa Barbara Channel. The northern part of the eastern arm has now become converted into high, rugged mountains, so little known geologically that its earlier history as part of the (ancestral) Ventura...

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