Seismic reflection profiles have been obtained in the western Blake-Bahama basin by using a 24-channel common-depth point (CDP) system. Reflectors extend horizontally across the basin to the Blake Escarpment; they are inferred to correlate with a Miocene turbidite, horizon A of Eocene age, horizon β of Neocomian age, and basaltic basement. Lower Cretaceous carbonaceous clays and shales also apparently extend across the Blake-Bahama basin. The interruption of these reflectors on the inner part of our southern profile probably is due to widespread minor faulting seaward of the Blake Escarpment near the end of Cretaceous or beginning of Tertiary time. This faulting might be at the site of an ancient fracture zone, reactivated by subsidence of the Blake Plateau.

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