GEOLOGY OF MOUNT HOLYOKE QUADRANGLE, MASSACHUSETTS

Research Article| April 01, 1957 GEOLOGY OF MOUNT HOLYOKE QUADRANGLE, MASSACHUSETTS ROBERT BALK ROBERT BALK Search for other works by this author on: GSW Google Scholar GSA Bulletin (1957) 68 (4): 481–504. https://doi.org/10.1130/0016-7606(1957)68[481:GOMHQM]2.0.CO;2 Article history received: 03 Sep 1954 first online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Twitter LinkedIn Tools Icon Tools Get Permissions Search Site Citation ROBERT BALK; GEOLOGY OF MOUNT HOLYOKE QUADRANGLE, MASSACHUSETTS. GSA Bulletin 1957;; 68 (4): 481–504. doi: https://doi.org/10.1130/0016-7606(1957)68[481:GOMHQM]2.0.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search nav search search input Search input auto suggest search filter All ContentBy SocietyGSA Bulletin Search Advanced Search Abstract The oldest bedrock formations in the Mt. Holyoke quadrangle, Massachusetts, are feldspathic schists, tentatively correlated with Emerson's Amherst schist, and pegmatite lenses, perhaps of late Paleozoic age. Next in order of decreasing age are the Triassic Sugarloaf arkose and Longmeadow sandstone, with a 300- to 400-foot diabase flow between them. The Granby tuff, with associated lava, pipes, sills, and dikes of diabase was erupted in early Longmeadow time and records an unusual phase of Appalachian Triassic vulcanism.The bedrock floor is extensively covered by unconsolidated Pleistocene and post-Pleistocene deposits. Only one till, presumably Wisconsin, is recognized. In the Connecticut Valley proper, lacustrine and outwash deposits of varved clay, silt, sand, and gravel are widespread. Recent flood-plain deposits consist of silt and sand.Rural settlements and dairy farms derive nearly all the water from the top of the late Pleistocene varved clay, an ideal aquifer at shallow depth. The Triassic sedimentary rocks could supply copious amounts of water, and artesian conditions should exist over part of the area. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not currently have access to this article.