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Advances in Nonmarine Karoo Biostratigraphy: Significance for Understanding Basin Development.

December 30 , 2016:

The nonmarine Permo-Jurassic deposits of the Karoo Supergroup of South Africa have long been a world standard for tetrapod biostratigraphy. Recent and ongoing research is revising the palaeoflora and palaeofauna of these sedimentary strata with an unprecedented level of stratigraphic precision. This work has shown that: Permian palynomorphs are useful for correlating time-equivalent lithostratigraphic units in different sectors of the basin; that there is a marked end-Guadalupian diversity drop in tetrapods; that the Dicynodon Assemblage Zone can be subdivided, and should be renamed as the Daptocephalus Assemblage Zone; that the Cynognathus Assemblage Zone has a robust threefold subdivision; and that the name Euskelosaurus for the Euskelosaurus Range Zone is invalid and should be replaced. This work, together with new radiometric dates from the Karoo Supergroup, has dramatically enhanced our understanding of the timing of major evolutionary events in terrestrial ecosystems and provides strong evidence for tectonic controls on accommodation and sedimentation in the Karoo Basin during the Permo-Jurassic, within an overall flexural basinal setting.

Bruce S. Rubidge , Michael O. Day, Natasha Barbolini, P. John Hancox, Jonah N. Choiniere, Marion K. Bamford, Pia A. Viglietti, Blair W. McPhee & Sifelani Jirah (2016)
Advances in Nonmarine Karoo Biostratigraphy: Significance for Understanding Basin Development.
Origin and Evolution of the Cape Mountains and Karoo Basin.
Regional Geology Reviews: 141-149
DOI: 10.1007/978-3-319-40859-0_14


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