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More than 200,000 km of single-channel and multi-channel seismic reflection data are used to construct an isopach map of sediment thickness and a map of depth to basement in the western North Atlantic Ocean basin, including the continental margins of eastern North America. Velocity regression equations and velocity estimates determined statistically from 17 provinces in the basin are used to convert reflection time in the sediments to thickness. The region between 15°N and 45°N lat. and between 40°W and 85°W long. is portrayed in Mercator projection at the scale of 1.0 in. per degree longitude (about 1:4,383,000 at equator). In this paper we outline the methods used for map preparation and discuss the most prominent features observed in basement struct re and in sediment thickness distribution.
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