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The sedimentary framework of the western Gulf of Maine and the southeastern Massachusetts offshore area has been interpreted from data obtained with a seismic profiler, supplemented by information from geology on land and from samples offshore. A geologic map, three generalized isopach maps, and a generalized contour map of the basement surface provide significant information relative to the framework. Four sedimentary units have been distinguished on the basis of seismic data and are inferred to be: (1) coastal-plain sediments of Late Cretaceous to early Pleistocene age, (2) moraine deposits of Pleistocene age, (3) glaciomarine and marine deposits of Pleistocene and Holocene age, and (4) glaciolacustrine deposits ·of late Pleistocene age. The distribution of the inferred coastal-plain deposits delineates drainage systems whose streams are believed to have carved the following features out of the coastal-plain and the shelf strata: the Gulf of Maine, thecuesta beneath Georges Bank, and the islands off southern New England. This erosion is believed to have taken place during late Tertiary or early Pleistocene time. The inferred moraine deposits overlie basement rocks or the unconformity on the coastal-plain deposits; they define stages in the retreat of the last glacier in coastal New England. The acoustic unit assigned to the glaciomarine and marine deposits. is believed to represent in part glacial rock flour carried into the marine environment by melt-water streams and in part silt and clay winnowed from the banks and ledges during the postglacial rise in sea level. The inferred glaciolacustrine deposits are thought to have been deposited in Cape Cod Bay during the retreat of the last ice in that area.

Sedimentary framework of the western Gulf of Maine and the southeastern Massachusetts offshore area