Youngest dinocephalian fossils extend the Tapinocephalus Zone, Karoo Basin, South Africa.

Show simple item record Day, M.O. Guven, S. Abdala, F. Jirah, S. Rubidge, B. Almond, J. 2017-01-13T10:12:05Z 2017-01-13T10:12:05Z 2015-03-01
dc.identifier.citation Day, M.O. et al. 2015. Youngest dinocephalian fossils extend the Tapinocephalus Zone, Karoo Basin, South Africa. South African Journal of Science 111 ( 3/4): Article number e2014-0309 en_ZA
dc.identifier.issn 0038-2353 (Print)
dc.identifier.issn 1996-7489 (Online)
dc.description.abstract The dinocephalians (Synapsida, Therapsida) were one of the dominant tetrapod groups of the Middle Permian (Guadalupian Epoch, ∼270-260 million years ago) and are most abundantly recorded in the Tapinocephalus Assemblage Zone (AZ) of the Main Karoo Basin, South Africa. Dinocephalians are thought to have become extinct near the top of the Abrahamskraal Formation of the Beaufort Group and their disappearance is one criterion used to define the base of the overlying Pristerognathus AZ. Because of the abundance of fossils in the Karoo, the Beaufort Group biozones form the biostratigraphic standard for later Permian terrestrial tetrapod ecosystems, so their stratigraphic delineation is of great importance to Permian palaeobiology. We report two new specimens of the rare tapinocephalid dinocephalian Criocephalosaurus from the lowermost Poortjie Member, which makes them the youngest dinocephalians known from the Main Karoo Basin and extends the Tapinocephalus AZ from the Abrahamskraal Formation up into the Teekloof Formation. The extension of the Tapinocephalus AZ relative to the lithostratigraphy potentially affects the biozone or biozones to which a fossil species can be attributed; this extension has implications for biostratigraphic correlations within the Main Karoo Basin as well as with other basins across Gondwana. These discoveries also indicate that a population of herbivorous tapinocephalids survived as rare constituents of the tetrapod fauna after most generic richness within the clade had already been lost. en_ZA
dc.language.iso en en_ZA
dc.publisher Academy of Science of South Africa (ASSAf) en_ZA
dc.rights © 2015. The Author(s). Published under a Creative Commons Attribution Licence. en_ZA
dc.subject Abrahamskraal en_ZA
dc.subject Biostratigraphy en_ZA
dc.subject Middle Permian en_ZA
dc.subject Pristerognathus en_ZA
dc.subject Tapinocephalus en_ZA
dc.title Youngest dinocephalian fossils extend the Tapinocephalus Zone, Karoo Basin, South Africa. en_ZA
dc.type Article en_ZA
dc.journal.volume 111 en_ZA
dc.journal.title South African Journal of Science en_ZA
dc.description.librarian NCS2016 en_ZA
dc.citation.doi 10.17159/sajs.2015/201403092015 en_ZA
dc.citation.epage 82 en_ZA
dc.citation.issue 3/4 en_ZA
dc.citation.spage 78 en_ZA

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