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The Bivalve Megadesmus from the Permian Volksrust Shale Formation (Karoo Supergroup), northeastern Karoo Basin, South Africa: implications for late Permian Basin development

2005; Geological Society of South Africa; Volume: 108; Issue: 4 Linguagem: Inglês

10.2113/108.4.547

1996-8590

Bruce Cairncross, N. J. Beukes, L.L. Coetzee, Ursula Rehfeld,

Geological and Geophysical Studies

Research Article| December 01, 2005 The Bivalve Megadesmus from the Permian Volksrust Shale Formation (Karoo Supergroup), northeastern Karoo Basin, South Africa: implications for late Permian Basin development B. Cairncross; B. Cairncross Department of Geology, University of Johannesburg, P.O. Box 524, Auckland Park, 2006, South Africa. e-mail: bc@rau.ac.za; njb@rau.ac.za Search for other works by this author on: GSW Google Scholar N.J. Beukes; N.J. Beukes Department of Geology, University of Johannesburg, P.O. Box 524, Auckland Park, 2006, South Africa. e-mail: bc@rau.ac.za; njb@rau.ac.za Search for other works by this author on: GSW Google Scholar L.L. Coetzee; L.L. Coetzee Department of Geology, University of Johannesburg, P.O. Box 524, Auckland Park, 2006, South Africa. Present address: SPECTRAU, University of Johannesburg, P.O. Box 524, Auckland Park, 2006, South Africa e-mail: llc@rau.ac.za Search for other works by this author on: GSW Google Scholar U. Rehfeld U. Rehfeld Institut für Paleontologie, Free University of Berlin, Maltererstrasse 74-100, D-12249, Berlin. Search for other works by this author on: GSW Google Scholar Author and Article Information B. Cairncross Department of Geology, University of Johannesburg, P.O. Box 524, Auckland Park, 2006, South Africa. e-mail: bc@rau.ac.za; njb@rau.ac.za N.J. Beukes Department of Geology, University of Johannesburg, P.O. Box 524, Auckland Park, 2006, South Africa. e-mail: bc@rau.ac.za; njb@rau.ac.za L.L. Coetzee Department of Geology, University of Johannesburg, P.O. Box 524, Auckland Park, 2006, South Africa. Present address: SPECTRAU, University of Johannesburg, P.O. Box 524, Auckland Park, 2006, South Africa e-mail: llc@rau.ac.za U. Rehfeld Institut für Paleontologie, Free University of Berlin, Maltererstrasse 74-100, D-12249, Berlin. Publisher: Geological Society of South Africa First Online: 09 Mar 2017 Online ISSN: 1996-8590 Print ISSN: 1012-0750 © 2005 Geological Society of South Africa South African Journal of Geology (2005) 108 (4): 547–556. https://doi.org/10.2113/108.4.547 Article history First Online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation B. Cairncross, N.J. Beukes, L.L. Coetzee, U. Rehfeld; The Bivalve Megadesmus from the Permian Volksrust Shale Formation (Karoo Supergroup), northeastern Karoo Basin, South Africa: implications for late Permian Basin development. South African Journal of Geology 2005;; 108 (4): 547–556. doi: https://doi.org/10.2113/108.4.547 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 SocietySouth African Journal of Geology Search Advanced Search Abstract The bivalve Megadesmus is described from the Late Permian Volksrust Shale Formation in the northeastern Karoo Basin, South Africa; this is the first reported discovery of this genus in Africa. The fossil is large, 9 cm dorsally and 8.4 cm laterally, and both valves are articulated indicating minimum transport after death. The bivalve was encased in interbedded siltstone-shale that constitutes the distal sediments of a prograding delta, at the Beaufort Group–Ecca Group boundary. Megadesmus is known from other continents (Australia, India, Siberia, South America and Tasmania) where its presence indicates exclusively marine conditions. The implication for the northeastern Karoo Basin during the Late Permian is that a marine enclave still existed in this geographic area, and that terrestrial conditions did not yet prevail as in the southern basin region. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.