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PALYNOLOGY IN SOUTHERN NORTH AMERICA

1955; Geological Society of America; Volume: 66; Issue: 5 Linguagem: Inglês

10.1130/0016-7606(1955)66[521

1943-2674

Paul B. Sears, Kathryn H. Clisby,

Rangeland and Wildlife Management

Research Article| May 01, 1955 PALYNOLOGY IN SOUTHERN NORTH AMERICA: PART IV: PLEISTOCENE CLIMATE IN MEXICO PAUL B SEARS; PAUL B SEARS DEPT. OF PLANT SCIENCE AND CONSERVATION PROGRAM, YALE UNIVERSITY, NEW HAVEN, CONN.; DEPT. OF GEOLOGY AND GEOGRAPHY, OBERLIN COLLEGE, OBERLIN, OHIO Search for other works by this author on: GSW Google Scholar KATHRYN H CLISBY KATHRYN H CLISBY DEPT. OF PLANT SCIENCE AND CONSERVATION PROGRAM, YALE UNIVERSITY, NEW HAVEN, CONN.; DEPT. OF GEOLOGY AND GEOGRAPHY, OBERLIN COLLEGE, OBERLIN, OHIO Search for other works by this author on: GSW Google Scholar Author and Article Information PAUL B SEARS DEPT. OF PLANT SCIENCE AND CONSERVATION PROGRAM, YALE UNIVERSITY, NEW HAVEN, CONN.; DEPT. OF GEOLOGY AND GEOGRAPHY, OBERLIN COLLEGE, OBERLIN, OHIO KATHRYN H CLISBY DEPT. OF PLANT SCIENCE AND CONSERVATION PROGRAM, YALE UNIVERSITY, NEW HAVEN, CONN.; DEPT. OF GEOLOGY AND GEOGRAPHY, OBERLIN COLLEGE, OBERLIN, OHIO Publisher: Geological Society of America Received: 20 May 1954 First Online: 02 Mar 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Copyright © 1955, 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 (1955) 66 (5): 521–530. https://doi.org/10.1130/0016-7606(1955)66[521:PISNA]2.0.CO;2 Article history Received: 20 May 1954 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 PAUL B SEARS, KATHRYN H CLISBY; PALYNOLOGY IN SOUTHERN NORTH AMERICA: PART IV: PLEISTOCENE CLIMATE IN MEXICO. GSA Bulletin 1955;; 66 (5): 521–530. doi: https://doi.org/10.1130/0016-7606(1955)66[521:PISNA]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 Pollen analysis of two deep lacustrine cores under Mexico City indicates a series of moist-dry oscillations with longer trends of changing temperature—a climatic record which appears to extend as far back as early Wisconsin. The individual moist pulsations, although marked by warmth, were evidently times of glacial nourishment; the dry phases, some of which were cool, were evidently times of abatement.The upper 50 m of the profiles indicate two episodes of maximum glaciation; the details that follow the more recent agree with present knowledge of the Cary-Mankato-Latest sequence of the Wisconsin. Under milder conditions between the postulated Taze-well and Cary glacial maxima, soil might have formed on exposed till. The base of the profiles indicates warm-moist conditions with falling temperature to about 50 m. Because of tectonic and volcanic disturbance, it is not clear whether this cooling represents a separate advance or merely an early phase of the first maximum above the 50-m level.For the tropical Mexico City area, it is shown that the moist periods of glacial nourishment were also relatively warm. 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.