A series of seismic refraction profiles have been established on and in the vicinity of Sable Island, which is on the edge of the continental shelf off Nova Scotia, Canada. The profiles suggest that the geologic column beneath the island consists of the following layers: unconsolidated sediment, compressional velocity 5,900 ft./sec., thickness 3,250 ft.; semi-consolidated sediment, compressional velocity 10,000 ft./sec., thickness 3,950 ft.; and consolidated sediment, compressional velocity 12,500 ft./sec., thickness 7,500 ft. The total thickness of sediment is 14,750 ft. and the compressional velocity in the "basement" beneath is 19,000 ft./sec. The ridge in the basement which has been proposed to underlie the margin of the shelf on the southwest, off Halifax, appears to continue northeast beneath Sable Island; the consolidated sediment is not confined to the landward side of this ridge, but appears to continue over it toward the continental slope.