SUBMERGED AND ERODED DRUMLINS OFF NORTHEASTERN MASSACHUSETTS

Streamlined, oval-shaped, oriented topographic highs in Massachusetts Bay are identified as the erosional remnants of drumlins. The topograp hic highs correlate with outlines of lag gravel deposits on the sea fl oor and both the highs and lag gravel seafloor footprint have a distin ct east-southeast long axis trend. This trend is similar to the prefer red orientation of the long axes of drumlins in the Boston Basin and i ndicates the flow direction of the late Wisconsinan Laurentide Ice She et. Modification of the drumlins occurred during two passages of the s horeline, the first during the late Wisconsinan marine regression when the drumlins were only slightly eroded. The second passage of the sho reline occurred during the marine transgression, when erosion, in the form of cliff-face retreat, removed the upper part of the drumlins.