Evidence for restricted ice extent during the last glacial maximum in the Koryak Mountains of Chukotka, far eastern Russia

Research Article| July 01, 2000 Evidence for restricted ice extent during the last glacial maximum in the Koryak Mountains of Chukotka, far eastern Russia Lyn Gualtieri; Lyn Gualtieri 1Department of Geosciences, University of Massachusetts, Amherst, Massachusetts 01003, USA Search for other works by this author on: GSW Google Scholar Olga Glushkova; Olga Glushkova 2Northeast Interdisciplinary Research Institute, Far Eastern Branch, Russian Academy of Sciences, 16 Portovaya Street, Magadan 685000, Russia Search for other works by this author on: GSW Google Scholar Julie Brigham-Grette Julie Brigham-Grette 1Department of Geosciences, University of Massachusetts, Amherst, Massachusetts 01003, USA Search for other works by this author on: GSW Google Scholar Author and Article Information Lyn Gualtieri 1Department of Geosciences, University of Massachusetts, Amherst, Massachusetts 01003, USA Olga Glushkova 2Northeast Interdisciplinary Research Institute, Far Eastern Branch, Russian Academy of Sciences, 16 Portovaya Street, Magadan 685000, Russia Julie Brigham-Grette 1Department of Geosciences, University of Massachusetts, Amherst, Massachusetts 01003, USA Publisher: Geological Society of America Received: 06 Jan 1999 Revision Received: 01 Jul 1999 Accepted: 18 Oct 1999 First Online: 01 Jun 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Geological Society of America GSA Bulletin (2000) 112 (7): 1106–1118. https://doi.org/10.1130/0016-7606(2000)112<1106:EFRIED>2.0.CO;2 Article history Received: 06 Jan 1999 Revision Received: 01 Jul 1999 Accepted: 18 Oct 1999 First Online: 01 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Lyn Gualtieri, Olga Glushkova, Julie Brigham-Grette; Evidence for restricted ice extent during the last glacial maximum in the Koryak Mountains of Chukotka, far eastern Russia. GSA Bulletin 2000;; 112 (7): 1106–1118. doi: https://doi.org/10.1130/0016-7606(2000)112<1106:EFRIED>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 Field evidence in the Koryak Mountains–Lake Mainitz region of far eastern Russia supports three Pleistocene glacial advances. The early Wisconsinan and pre-Wisconsinan glaciations are represented by broad lobate moraines extending as much as 30 km north of the Koryak Mountains. Field evidence demonstrates that the terminal, lateral, and medial moraines, as well as meltwater channels, dead ice topography, kettles, and outwash plains mark the extent of ice during the last glacial maximum (LGM), during which glaciers reached no more than 20 km beyond their present limits. Those emanating from the southern Koryak Mountains may have reached the Bering Sea. Numerical and relative dating techniques support these results and test the theoretical models of the LGM in western Beringia. Erratics on moraines and glaciofluvial terraces, common to all valleys at 13–13.8 m above river level, yield 36Cl exposure ages ranging from 10.08 to 25.78 ka. The Koryak Mountains–Lake Mainitz record of glaciation is spatially and temporally consistent with the glaciation pattern across central Beringia found in other terrestrial and marine records. Glacier growth in the Koryak Mountains was sustained by possible increased summer sea surface temperatures and precipitation in the northwest Pacific region. Evidence from the northern Koryak Mountains (lat 64°N, long 177°E) indicates that the extent of ice in western Beringia was limited to mountain and valley glaciers during the LGM. This field-based research contradicts M.G. Grosswald's theoretical Beringian ice sheet hypothesis. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.