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• W1964990749 abstract "Research Article| March 01, 2013 A new chronology for middle Eocene–early Miocene South American Land Mammal Ages Regan E. Dunn; Regan E. Dunn † 1Department of Biology, University of Washington, Box 351800, 24 Kincaid Hall, Seattle, Washington 98195, USA †E-mail: dunnr@uw.edu Search for other works by this author on: GSW Google Scholar Richard H. Madden; Richard H. Madden 2Department of Organismal Biology & Anatomy, University of Chicago, Chicago, Illinois 60637, USA Search for other works by this author on: GSW Google Scholar Matthew J. Kohn; Matthew J. Kohn 3Department of Geosciences, Boise State University, 1910 University Drive, Boise, Idaho 83725, USA Search for other works by this author on: GSW Google Scholar Mark D. Schmitz; Mark D. Schmitz 3Department of Geosciences, Boise State University, 1910 University Drive, Boise, Idaho 83725, USA Search for other works by this author on: GSW Google Scholar Caroline A.E. Strömberg; Caroline A.E. Strömberg 1Department of Biology, University of Washington, Box 351800, 24 Kincaid Hall, Seattle, Washington 98195, USA Search for other works by this author on: GSW Google Scholar Alfredo A. Carlini; Alfredo A. Carlini 4División Paleontología de Vertebrados, Universidad Nacional de La Plata y Museo, Paseo del Bosque s/n, B1900FWA La Plata, Argentina (CONICET) Search for other works by this author on: GSW Google Scholar Guillermo H. Ré; Guillermo H. Ré 5Departamento de Ciencias Geológicas, Universidad de Buenos Aires, Ciudad Universitaria Pabellón 2, C1428EHA Buenos Aires, Argentina Search for other works by this author on: GSW Google Scholar James Crowley James Crowley 3Department of Geosciences, Boise State University, 1910 University Drive, Boise, Idaho 83725, USA Search for other works by this author on: GSW Google Scholar GSA Bulletin (2013) 125 (3-4): 539–555. https://doi.org/10.1130/B30660.1 Article history received: 15 Dec 2011 rev-recd: 27 Sep 2012 accepted: 02 Oct 2012 first online: 08 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 Regan E. Dunn, Richard H. Madden, Matthew J. Kohn, Mark D. Schmitz, Caroline A.E. Strömberg, Alfredo A. Carlini, Guillermo H. Ré, James Crowley; A new chronology for middle Eocene–early Miocene South American Land Mammal Ages. GSA Bulletin 2013;; 125 (3-4): 539–555. doi: https://doi.org/10.1130/B30660.1 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 Cenozoic South American Land Mammal Ages (SALMAs) have historically been correlated to the geologic time scale using 40Ar/39Ar dating and magnetostratigraphy. At Gran Barranca (68.7°W, 45.7°S)—one of South America’s key areas for constraining SALMAs—existing radioisotopic ages have uncertainties of up to 4 m.y. To better constrain the ages of mammalian assemblages, we employed high-precision (±<40 k.y.) U-Pb dating using single zircon crystals. We dated nine tuffs from the Sarmiento Formation containing middle Eocene–early Miocene faunas (Barrancan, Mustersan, Tinguirirican, Deseadan, Colhuehuapian, and “Pinturan”). The new dates span from 39.861 ± 0.037 Ma to 19.041 ± 0.027 Ma. The La Cancha Tuff, occurring within the Tinguirirican faunal level yielded an age of 33.581 ± 0.015 Ma, confirming that the Vera Member contains the only fossiliferous geologic section encompassing the Eocene–Oligocene transition in the Southern Hemisphere. The pre-Deseadan fauna, La Cantera, is ≤30.77 Ma, the age of the Colhuehuapian is expanded to 21.1–20.1 Ma, and the Pinturan may be as old as ca. 19 Ma.The new U-Pb dates confirm that atmospheric temperatures and vegetation remained constant across the Eocene–Oligocene transition in Patagonia and that hypsodonty occurred in South American ungulates much earlier than on any other continent. Additionally, refinement of the SALMA boundaries will eventually provide the context necessary to compare faunal transitions across continents, although currently too much data are missing to allow such comparisons. Finally, the new ages provide a high-resolution age model from which hypotheses about rates of environmental and evolutionary change at Gran Barranca can be tested. You do not have access to this content, please speak to your institutional administrator if you feel you should have access." @default.
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• W1964990749 date "2012-12-10" @default.
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• W1964990749 title "A new chronology for middle Eocene-early Miocene South American Land Mammal Ages" @default.
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• W1964990749 doi "https://doi.org/10.1130/b30660.1" @default.
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