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Smith, R.M.H. 1990. A review of stratigraphy and sedimentary environments of the Karoo Basin of South Africa. Journal of African Earth Sciences (and the Middle East), 10(1–2): 117–137


Description:

A review of stratigraphy and sedimentary environments of the Karoo Basin of South Africa.

Summary / Notes:

The Karoo Supergroup covers almost two thirds of the present land surface of southern Africa. Its strata record an almost continuous sequence of continental sedimentation that began in the Permo-Carboniferous (280 Ma) and terminated in the early Jurassic 100 million years later. The glacio-marine to terrestrial sequence accumulated in a variety of tectonically controlled depositories under progressively more arid climatic conditions. Numerous vertebrate fossils are preserved in these rocks, including fish, amphibians, primitive aquatic reptiles, primitive land reptiles, more advanced mammal-like reptiles, dinosaurs and even the earliest mammals. Palaeoenvironmental analysis of the major stratigraphic units of the Karoo sequence demonstrates the effects of more localised tectonic basins in influencing depositional style. These are superimposed on a basinwide trend of progressive aridification attributed to the gradual northward migration of southwestern Gondwanaland out of polar climes and accentuated by the meteoric drying effect of the surrounding land masses. Combined with progressive climatic drying was a gradual shrinking of the basin brought about by the northward migration of the subducting palaeo-Pacific margin to the south.

Year: 1990

Type: Journal Article

URL: http://www.sciencedirect.com/science/article/pii/089953629090050O


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Smith, R.M.H. 1990. A review of stratigraphy and sedimentary environments of the Karoo Basin of South Africa. Journal of African Earth Sciences (and the Middle East), 10(1–2): 117–137
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