Chitinozoans and the age of the Soom Shale, an Ordovician black shale Lagerstatte, South Africa
Vandenbroucke, T.R.A.; Gabbott, S.E.; Paris, F.; Aldridge, R.J.; Theron, J.N. (2009). Chitinozoans and the age of the Soom Shale, an Ordovician black shale Lagerstatte, South Africa. J. Micropalaeontol. 28(1): 53-66. dx.doi.org/10.1144/jm.28.1.53
In: Journal of Micropalaeontology. Geological Society: London?. ISSN 0262-821X; e-ISSN 2041-4978, meer
Isolated chitinozoans from the Soom Shale Member of the Cedarberg Formation, SW South Africa are described and provide a date of the latest Hirnantian–earliest Rhuddanian. The recovered chitinozoans are typical of the latest Ordovician Spinachitina oulebsiri Biozone, although an earliest Silurian age is possible. They indicate a very short time span (less than 1 Ma) across the Ordovician–Silurian boundary. This is currently the highest biostratigraphical resolution attainable for the Soom Shale Lagerstätte. Correlation of the Soom Shale chitinozoans with identical assemblages in post-glacial, transgressive deposits of Northern Africa is possible; both faunas occur in shales that overlie glacial diamictites of the Hirnantian glaciation. A new species, Spinachitina verniersi n. sp. is described.
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