Preliminary report on the seismic investigations in the Harwich and Dennis quadrangles, Massachusetts

Geologic map of the Harwich quadrangle, Barnstable County, Cape Cod, Massachusetts

“…Therefore the drift on Cape Cod is believed to be about 14,000 to 15,000 years old. The oldest deposits in the quadrangle are the till and silt identified in the boreholes and seismic surveys (Koteff and Cotton, 1962;Oldale and Tuttle, 1965). The till is believed to be a basal till deposited by the last ice.…”

Use of ground-penetrating radar for water-table mapping, Brewster and Harwich, Massachusetts

“…In the study area, bedrock ranges in altitude from more than 500 ft below sea level along Nantucket Sound to less than 300 ft below sea level near Cape Cod Bay (Oldale and Tuttle, 1965). The bedrock is overlain by stratified drift, which is mainly composed of sand, with some gravel, silt, and clay, and, locally, till.…”