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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
High-precision temporal calibration of Late Permian vertebrate biostratigraphy: U-Pb zircon constraints from the Karoo Supergroup, South Africa
Geology, Volume 41, No. 3, Year 2013
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Description
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. © 2013 Geological Society of America.
Authors & Co-Authors
Rubidge, Bruce Sidney
South Africa, Johannesburg
University of the Witwatersrand
Erwin, Douglas H.
United States, Washington, D.c.
Smithsonian National Museum of Natural History
United States, Santa fe
Santa fe Institute
Ramezani, Jahandar A.
United States, Cambridge
Massachusetts Institute of Technology
Bowring, Samuel A.
United States, Cambridge
Massachusetts Institute of Technology
de Klerk, William J.
South Africa, Grahamstown
Rhodes University
Statistics
Citations: 188
Authors: 5
Affiliations: 5
Identifiers
Doi:
10.1130/G33622.1
ISSN:
00917613
e-ISSN:
19432682
Study Locations
South Africa