Abstract
Research Article| May 01, 1955 PALYNOLOGY IN SOUTHERN NORTH AMERICA: PART II: STUDY OF TWO CORES FROM LAKE SEDIMENTS OF THE MEXICO CITY BASIN FRED FOREMAN FRED FOREMAN OBERLIN COLLEGE, OBERLIN, OHIO Search for other works by this author on: GSW Google Scholar Author and Article Information FRED FOREMAN OBERLIN COLLEGE, OBERLIN, OHIO Publisher: Geological Society of America Received: 18 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): 475–510. https://doi.org/10.1130/0016-7606(1955)66[475:PISNA]2.0.CO;2 Article history Received: 18 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 FRED FOREMAN; PALYNOLOGY IN SOUTHERN NORTH AMERICA: PART II: STUDY OF TWO CORES FROM LAKE SEDIMENTS OF THE MEXICO CITY BASIN. GSA Bulletin 1955;; 66 (5): 475–510. doi: https://doi.org/10.1130/0016-7606(1955)66[475: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 Two cores taken from near the center of Mexico City are each divisible into seven zones; the division is based on differences in texture, biota, waterholding capacity, and stratigraphy. Zones of the same number in each of the cores are similar in nearly all respects.The lake and its surrounding basin are in the same physiographic and climatic province, and the rocks of the basin are consanguineous and are either pyroclastics or flows. Rocks in the Mexico City basin are predominantly glassy or hypocrystalline; many are vesicular and subject to rapid weathering and generally are easily eroded. Sediments derived from these rocks are rather sensitive indicators of variations in climate. Throughout the time sedimentation was taking place in the lake there were in this region many volcanic eruptions, and some tectonic activity, and these too have affected the vegetation and lake sediments, which include clays, fresh to weathered particles of ash and clastics from the flows, and authigenic, chemical, and organic deposits as well as pollen and plant fragments. A tentative history is given of the climates, volcanism, and tectonic activity in this area during the time represented by the sediments. 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.
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