Glaciation on the Continental Margin off New England

Abstract

Research Article| November 01, 1969 Glaciation on the Continental Margin off New England RICHARD M PRATT; RICHARD M PRATT Virginia Polytechnic Institute, Blacksburg, Virginia 24060 Search for other works by this author on: GSW Google Scholar JOHN SCHLEE JOHN SCHLEE U.S. Geological Survey, Woods Hole, Massachusetts 02543 Search for other works by this author on: GSW Google Scholar Author and Article Information RICHARD M PRATT Virginia Polytechnic Institute, Blacksburg, Virginia 24060 JOHN SCHLEE U.S. Geological Survey, Woods Hole, Massachusetts 02543 Publisher: Geological Society of America Received: 14 Apr 1969 First Online: 02 Mar 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Copyright © 1969, The Geological Society of America, Inc. Copyright is not claimed on any material prepared by U.S. government employees within the scope of their employment. GSA Bulletin (1969) 80 (11): 2335–2342. https://doi.org/10.1130/0016-7606(1969)80[2335:GOTCMO]2.0.CO;2 Article history Received: 14 Apr 1969 First Online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation RICHARD M PRATT, JOHN SCHLEE; Glaciation on the Continental Margin off New England. GSA Bulletin 1969;; 80 (11): 2335–2342. doi: https://doi.org/10.1130/0016-7606(1969)80[2335:GOTCMO]2.0.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGSA Bulletin Search Advanced Search Abstract The Pleistocene glacial limit in the marine environment off New England can be traced by plotting the seaward limit of abundant sandy gravel and the position of shoals. Maximum limit of the last glaciation was probably along an irregular line extending through Nantucket Shoals, across Great South Channel, northern Georges Bank, and at least to the edge of the Scotian Shelf. If, as we assume, glaciers lowered sea level approximately 130 m, the ice margin was probably a subaerial one on Nantucket Shoals and Georges Bank, and it was bordered by outwash and meltwater channels leading away from the ice front. On the Scotian Shelf, the margin may have bordered directly on the ocean, to judge by the lack of shoals and the widespread dispersion of gravel out to the shelf edge. The glaciofluvial nature of the original deposits and marine reworking during the eustatic rise in sea level have made it difficult to recognize ice-contact deposits near the limit of maximum glacial advance. The gravel on shallow banks and ledges is in a bimodal mixture with sand. Association of coarse gravel and sand suggests postdepositional reworking of till by marine processes and removal of silt and clay. Gravel in the Gulf of Maine is mixed with sand, silt, and clay, a mixture characteristic of till. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.