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Magnetic Polarity Stratigraphy of Pliocene-Pleistocene Terrestrial Deposits and Vertebrate Faunas, San Pedro Valley, Arizona
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1975
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EngineeringGeomorphologyEarth ScienceRegional GeologySocial SciencesMagnetic Polarity ZonesPaleoenvironmental ReconstructionMagnetic Polarity StratigraphyQuaternary ResearchGeological DataGeochronologyIntegrated StratigraphySan Pedro ValleyGeographyGeologyPliocene-pleistocene Terrestrial DepositsEarth SciencesPaleoecologyGsa Bulletin 1975Quaternary Period
Research Article| January 01, 1975 Magnetic Polarity Stratigraphy of Pliocene-Pleistocene Terrestrial Deposits and Vertebrate Faunas, San Pedro Valley, Arizona NOYE M. JOHNSON; NOYE M. JOHNSON 1Department of Earth Sciences, Dartmouth College, Hanover, New Hampshire 03755 Search for other works by this author on: GSW Google Scholar NEIL D. OPDYKE; NEIL D. OPDYKE 2Lamont-Doherty Geological Observatory and Department of Geology, Columbia University, Palisades, New York 10964 Search for other works by this author on: GSW Google Scholar EVERETT H. LINDSAY EVERETT H. LINDSAY 3Geoscience Department, University of Arizona, Tucson, Arizona 85721 Search for other works by this author on: GSW Google Scholar Author and Article Information NOYE M. JOHNSON 1Department of Earth Sciences, Dartmouth College, Hanover, New Hampshire 03755 NEIL D. OPDYKE 2Lamont-Doherty Geological Observatory and Department of Geology, Columbia University, Palisades, New York 10964 EVERETT H. LINDSAY 3Geoscience Department, University of Arizona, Tucson, Arizona 85721 Publisher: Geological Society of America First Online: 01 Jun 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Geological Society of America GSA Bulletin (1975) 86 (1): 5–12. https://doi.org/10.1130/0016-7606(1975)86<5:MPSOPT>2.0.CO;2 Article history First Online: 01 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation NOYE M. JOHNSON, NEIL D. OPDYKE, EVERETT H. LINDSAY; Magnetic Polarity Stratigraphy of Pliocene-Pleistocene Terrestrial Deposits and Vertebrate Faunas, San Pedro Valley, Arizona. GSA Bulletin 1975;; 86 (1): 5–12. doi: https://doi.org/10.1130/0016-7606(1975)86<5:MPSOPT>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 Horizontally stratified magnetic zones are observed throughout the Pliocene-Pleistocene valley fill of the upper San Pedro Valley, Arizona. Within one detailed 150-m stratigraphic section (Curtis Ranch), twelve superposed magnetic polarity zones are identified spanning the time from the upper Gilbert Epoch through the Brunhes Epoch. These magnetic polarity zones extend over a 64-km stretch of the valley and serve as convenient chronostratigraphic units. Based on the position of mammalian fossils within the chronostratigraphic zones, we have defined four mammal datum planes for the upper San Pedro Valley, including the first appearance of Lepus sp. at 1.9 m.y. Lepus sp. marks the first occurrence of a definitive Irvingtonian land mammal in the San Pedro Valley and thus places the local boundary of the Irvingtonian Land Mammal Age shortly below the Olduvai event. This position equates approximately with the Pliocene-Pleistocene boundary of the pelagic marine record. 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.