Abstract
A new seismic profiling system consisting of a hydroacoustic transducer with a correlation receiver has yielded a detailed profile of the outer continental margin off New England. The profile shows new evidence of Cenozoic sedimentation and shallow geologic structure. Two major reflectors are tenatively identified as Early Tertiary and Pliocene-Pleistocene in age. The former is erosional in part, showing a sea cliff at the edge of a continental shelf. This demonstrates an 850-meter subsidence of the region since Early Tertiary time. The Late Tertiary sediments in general are evenly bedded, sheet-like strata in sharp contrast to the Pleistocene wedge-like bottomset beds of the Block delta formed during the glacial lowering of sea level. The shelf edge and shoreline have migrated northward because the sediment supply has not been sufficient to build up the continental shelf and slope to compensate for the relative regional subsidence.
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