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Middle-Late Permian mass extinction on land

2006; Geological Society of America; Volume: 118; Issue: 11-12 Linguagem: Inglês

10.1130/b26011.1

1943-2674

Gregory J. Retallack, C. A. Metzger, Tara L. Greaver, A. Hope Jahren, Roger M. H. Smith, Nathan D. Sheldon,

Geological formations and processes

Research Article| November 01, 2006 Middle-Late Permian mass extinction on land Gregory J. Retallack; Gregory J. Retallack 1Department of Geological Sciences, University of Oregon, Eugene, Oregon 97403-1272, USA Search for other works by this author on: GSW Google Scholar Christine A. Metzger; Christine A. Metzger 1Department of Geological Sciences, University of Oregon, Eugene, Oregon 97403-1272, USA Search for other works by this author on: GSW Google Scholar Tara Greaver; Tara Greaver 2Department of Earth and Planetary Sciences, Johns Hopkins University, Baltimore, Maryland 21218, USA Search for other works by this author on: GSW Google Scholar A. Hope Jahren; A. Hope Jahren 2Department of Earth and Planetary Sciences, Johns Hopkins University, Baltimore, Maryland 21218, USA Search for other works by this author on: GSW Google Scholar Roger M.H. Smith; Roger M.H. Smith 3Department of Karoo Palaeontology, Iziko South African Museum, P.O. Box 61, Cape Town 8000, South Africa Search for other works by this author on: GSW Google Scholar Nathan D. Sheldon Nathan D. Sheldon 4Department of Geology, Royal Holloway University of London, Egham, Surrey TW20 OEX, England Search for other works by this author on: GSW Google Scholar GSA Bulletin (2006) 118 (11-12): 1398–1411. https://doi.org/10.1130/B26011.1 Article history received: 30 Mar 2006 rev-recd: 27 Jun 2006 accepted: 10 Jul 2006 first online: 03 Oct 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Gregory J. Retallack, Christine A. Metzger, Tara Greaver, A. Hope Jahren, Roger M.H. Smith, Nathan D. Sheldon; Middle-Late Permian mass extinction on land. GSA Bulletin 2006;; 118 (11-12): 1398–1411. doi: https://doi.org/10.1130/B26011.1 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 The end-Permian mass extinction has been envisaged as the nadir of biodiversity decline due to increasing volcanic gas emissions over some 9 million years. We propose a different tempo and mechanism of extinction because we recognize two separate but geologically abrupt mass extinctions on land, one terminating the Middle Permian (Guadalupian) at 260.4 Ma and a later one ending the Permian Period at 251 Ma. Our evidence comes from new paleobotanical, paleopedological, and carbon isotopic studies of Portal Mountain, Antarctica, and comparable studies in the Karoo Basin, South Africa. Extinctions have long been apparent among marine invertebrates at both the end of the Guadalupian and end of the Permian, which were also times of warm-wet greenhouse climatic transients, marked soil erosion, transition from high- to low-sinuosity and braided streams, soil stagnation in wetlands, and profound negative carbon isotope anomalies. Both mass extinctions may have resulted from catastrophic methane outbursts to the atmosphere from coal intruded by feeder dikes to flood basalts, such as the end-Guadalupian Emeishan Basalt and end-Permian Siberian Traps. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.