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Thick sections of Eocene and Miocene sedimentary rocks are exposed on Santa Rosa Island. Faulting has influenced structural development to a large extent. Slickensides check the conclusion that horizontal movement has been greater than vertical along the principal faults. Greatest displacement is apparent along the Santa Rosa fault, which splits the Island into north and south parts. Eocene sedimentary rocks are exposed over large areas south of this fault but do not outcrop north of it. Interesting structures are the Hoya Vieja, Pedregosa, Cerro Pablo, and Arlington anticlines; the Pedregosa, Santa Rosa, and Beecher's Bay synclines.
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