Submerged River System of Chesapeake Bay

Research Article| July 01, 1957 SUBMERGED RIVER SYSTEM OF CHESAPEAKE BAY JOHN T HACK JOHN T HACK U. S. GEOLOGICAL SURVEY, WASHINGTON 25, D. C. Search for other works by this author on: GSW Google Scholar Author and Article Information JOHN T HACK U. S. GEOLOGICAL SURVEY, WASHINGTON 25, D. C. Publisher: Geological Society of America Received: 17 Oct 1956 First Online: 02 Mar 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Copyright © 1957, 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 (1957) 68 (7): 817–830. https://doi.org/10.1130/0016-7606(1957)68[817:SRSOCB]2.0.CO;2 Article history Received: 17 Oct 1956 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 JOHN T HACK; SUBMERGED RIVER SYSTEM OF CHESAPEAKE BAY. GSA Bulletin 1957;; 68 (7): 817–830. doi: https://doi.org/10.1130/0016-7606(1957)68[817:SRSOCB]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 Logs of driving tests and borings in the deposits under the tidal estuaries in the Chesapeake Bay region have been obtained at 14 bridge sites over the Potomac, Susquehanna, Rappahannock, York, and other rivers and over Chesapeake Bay itself. The estuaries of this region are submerged river valleys cut into the Cretaceous and Tertiary sediments of the Coastal Plain, but they now contain a fill consisting of sand and gravel overlain by sandy silt of alluvial and estuarine origin. The youngest deposits are semiliquid silts (river mud) probably deposited by marine currents. Studies of ground-water supplies in terraces less than 15 feet above sea level that border some of the rivers indicate that there may be two fills of different ages separated by an unconformity and that each represents a different period of low sea level during Pleistocene time. The gradients of some river profiles steepen near the master stream, an inheritance from the period of low sea level in Pleistocene time when base level was lowered. Swampy and braided stream reaches result from the adjustment of the channel cross section to the inherited steep slope. 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.