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High-precision temporal calibration of Late Permian vertebrate biostratigraphy; U-Pb zircon constraints from the Karoo Supergroup, South Africa

Bruce S. Rubidge, Douglas H. Erwin, Jahandar Ramezani, Samuel A. Bowring and William J. de Klerk
High-precision temporal calibration of Late Permian vertebrate biostratigraphy; U-Pb zircon constraints from the Karoo Supergroup, South Africa
Geology (Boulder) (January 2013) 41 (3): 363-366

Abstract

Therapsid and other tetrapod fossils from the South African Karoo Supergroup provide the most detailed and best studied terrestrial vertebrate record of the Middle and Late Permian. The resulting biostratigraphic scheme has global applicability. Establishing a temporal framework for these faunas has proven difficult: magnetostratigraphy has been hampered by a Jurassic overprint, and intercorrelation with Permian marine sequences has been equivocal. Here we report U-Pb zircon isotope dilution-thermal ionization mass spectrometry (ID-TIMS) dates for five volcanic ashes interbedded with fossils from the Pristerognathus, Tropidostoma, and Cistecephalus vertebrate biozones of the Beaufort Group. This temporal framework allows correlation to marine zonations and improves understanding of rates of faunal evolution and patterns of basin evolution. Our results identify no correlative vertebrate extinctions in the Karoo Supergroup to the marine end-Guadalupian mass extinction and raise the question of whether there is any record of a terrestrial extinction related to the Emeishan large igneous province.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 41
Serial Issue: 3
Title: High-precision temporal calibration of Late Permian vertebrate biostratigraphy; U-Pb zircon constraints from the Karoo Supergroup, South Africa
Affiliation: University of the Witwatersrand, School of Geosciences, Witwatersrand, South Africa
Pages: 363-366
Published: 20130104
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 37
Accession Number: 2013-014353
Categories: StratigraphyGeochronology
Document Type: Serial
Bibliographic Level: Analytic
Annotation: GSA Data Repository item 2013096
Illustration Description: illus. incl. strat. col., 1 table, geol. sketch map
S35°00'00" - S22°00'00", E16°00'00" - E33°00'00"
Secondary Affiliation: National Museum of Natural History, USA, United StatesMassachusetts Institute of Technology, USA, United StatesRhodes University, ZAF, South Africa
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2022, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 201310
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