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Eunotosaurus biostratigraphic correlation in the Karoo of South Africa (free pdf)



From: Ben Creisler
bcreisler@gmail.com

A recent non-dino paper that may be of interest. The article is open access.

Mike Day, Bruce Rubidge, John Almond & Sifelani Jirah (2013)
Biostratigraphic correlation in the Karoo: The case of the Middle
Permian parareptile Eunotosaurus.
South African Journal of Science 109(3/4): Art. #0030 (4 pages)
doi: http://dx.doi.org/10.1590/sajs.2013/20120030
http://www.sajs.co.za/biostratigraphic-correlation-karoo-case-middle-permian-parareptile-eunotosaurus/mike-day-bruce-rubidge-john-almond-sifelani-jirah


The richness of fossil tetrapods from the Beaufort Group of South
Africa has enabled biostratigraphic subdivision of this Permo-Triassic
succession, with global applicability. Despite being the thickest of
the seven biozones recognised, attempts at further subdivision of the
Middle Permian TapinocephalusAssemblage Zone (Abrahamskraal Formation)
have not been successful, largely because the exact stratigraphic
ranges of fossil taxa are unknown. This gap in knowledge has limited
stratigraphic correlation of the Abrahamskraal Formation and hindered
understanding of Middle Permian Karoo basin development. Currently,
the lowermost Beaufort Group is split between an eastern and a western
stratigraphic scheme and, because of poor outcrop and the relative
paucity of fossils in the east, stratigraphic correlation between the
two areas has been uncertain. Recent fossil discoveries of the
parareptile Eunotosaurus africanus in the Eastern Cape and Free State
provinces have extended its known geographic range in the east. An
additional specimen from the lower Middleton Formation in the Eastern
Cape has, for the first time, enabled the biostratigraphic correlation
of this unit with the Poortjie Member of the Teekloof Formation in the
west. These finds confirm the diachroneity of the boundary between the
marine Ecca Group and the terrestrial Beaufort Group.