Sable Island is on the edge of the continental shelf off Nova Scotia, Canada. Refraction profiles suggest geologic column beneath Sable Island as follows, compressional velocity and thickness of sediments given: unconsolidated layer, 5,900 ft/sec, 3,250 feet; semiconsolidated layer, 10,000 ft/sec., 3,950 feet; and consolidated layer 12,500 ft/sec, 7,500 feet for a total thickness of sediment of 14,750 feet. Compressional velocity of basement beneath is 19,000 ft/sec. A basement ridge proposed to underlie the shelf margin to the southwest, off Halifax, appears to continue northeast beneath Sable Island. Consolidated sediment appears to cross over the ridge and continue toward the continental slope.

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