Abstract
The Woods Hole Oceanographic Institution's continuous seismic profiler was used in Cape Cod Bay to make two hundred miles of reflection profiles and eight oblique reflection-refraction stations. From these the areal extent and velocities of the principal seismic layers were determined. The deepest layer found (having a compressional wave velocity of 15,000-16,500 feet per second; 4.6-5.0 kilometers per second) is interpreted as Paleozoic in age. Its top surface forms an open-ended basin which deepens northeastward from the northeast entrance of Cape Cod Canal. Overlying it are patches of material (10,000-13,000 feet per second; 3.0-4.0 kmps) which are interpreted as erosional remnants of Cretaceous sediments. Of still younger age are three horizons with material having a compressional wave velocity in the 6,000-8,000 feet per second (1.8-2.4 kmps) range. The deepest seems likely to be marine Tertiary. The intermediate one is believed to be glacial till, and the shallowest a thin covering of postglacial sediments.
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