Late Pleistocene Glacial Events and Relative Sea-Level Changes in the Northern Puget Lowland, Washingtonстатья из журнала
Аннотация: Research Article| December 01, 1963 Late Pleistocene Glacial Events and Relative Sea-Level Changes in the Northern Puget Lowland, Washington DONALD J EASTERBROOK DONALD J EASTERBROOK Dept. Geology, Western Washington State College, Bellingham, Wash Search for other works by this author on: GSW Google Scholar GSA Bulletin (1963) 74 (12): 1465–1483. https://doi.org/10.1130/0016-7606(1963)74[1465:LPGEAR]2.0.CO;2 Article history received: 22 Apr 1963 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 DONALD J EASTERBROOK; Late Pleistocene Glacial Events and Relative Sea-Level Changes in the Northern Puget Lowland, Washington. GSA Bulletin 1963;; 74 (12): 1465–1483. doi: https://doi.org/10.1130/0016-7606(1963)74[1465:LPGEAR]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 During the late Pleistocene the Vashon glacier, a lobe of Cordilleran ice which at its maximum was 5300–7000 feet thick in northern Washington, occupied most of the Puget Lowland. During a late stage in the recession of the glacier when the ice was no more than a few hundred feet thick marine waters entered the area, floating the ice. Organisms living on the sea floor were incorporated in glaciomarine drift deposited beneath the floating ice. Radiocarbon dates from shells in the drift indicate an age of 11,660 ± 350 years (W-996).Several hundred feet of emergence followed, during which fluvial and lacustrine sediments were deposited. A radiocarbon date from wood at the base of these sediments indicates deposition had begun by 11,640 ± 275 years ago (W-940).A readvance of ice into northern Washington from British Columbia coincided with submergence of the lowland. Marine water and floating ice again covered the area depositing a second glaciomarine drift in places now at least 400 feet, and perhaps as high as 600 feet above sea level. Radiocarbon dates of 11,800 ± 400 (I-1037) and 10,370 ± 300 (I-1035) were obtained from wood in the deposits of two localities.Emergence and deposition of till and outwash occurred near the Canadian border about 11,000 years ago.Radiocarbon dates and stratigraphic relationships suggest that 350 feet of emergence, 500–700 feet of submergence, and emergence of 500–700 feet occurred in a period of only 1000–2000 years. These changes in relative sea level during such a short period may have resulted from a combination of two opposed tendencies, isostatic uplift of the land due to glacial unloading, and custatic rise of sea level, superimposed on tectonic movement. 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.
Год издания: 1963
Авторы: DONALD J. EASTERBROOK
Издательство: Geological Society of America
Источник: Geological Society of America Bulletin
Ключевые слова: Geology and Paleoclimatology Research
Открытый доступ: closed
Том: 74
Выпуск: 12
Страницы: 1465–1465