Geophysical Investigation of Cape Cod Bay, Massachusetts, Using the Continuous Seismic Profiler

Atlantic Continental Shelf and Slope of the United States - Gravels of the northeastern part

“…Hoskins and Knott ( 1961, fig. 9) infer thicknesses of l;)-137 m for glacial debris in Cape Cod Hay by use of a continuous seismic profiler.…”

Geological Survey research 1966, Chapter B

“…Deposits reported by Drake and others (1954) from immediately north and east of Cashes Ledge, and having a compressive velocity of 12,000-13,000 feet per second (4.0 km per sec), may be part of the Paleozoic basement or may be Cretaceous in age. Deposits having such velocities were also reported by Hoskins and Knott (1961) from Cape Cod Bay, and because of similarities between the Cape Cod Bay sediments and the known Cretaceous strata off Gay Head, Martha's Vineyard, Hoskins and Knott suggested that the deposits in Cape Cod Bay are probably Cretaceous in age. The rocks north and east of Cashes Ledge may also be of the same age.…”

Gravity study of Cape Cod Bay

“…Two gravity profiles were drawn: one parallel to 42°N latitude from Plymouth to Long Point for which good subsurface information is available (Hoskins and Knott, 1960); the other from the mouth of the Cape Cod Canal -_t to Orleans (41°47' N. lat.).…”

“…Geophysical depth determinations, both by seismic and magnetic methods, confirm the same shallow depth (Griscom and Bromery, 1968)'. Seismic studies in the Bay indicate shallow burial of the crystalline basement with sediment cover ranging from zero at Plymouth to slightly more than 0.2 km in the forearm of the Cape (Hoskins and Knott, 1960;Oldale and O'Hara, 1974;O'Hara and Oldale, 1976).…”