The paper by Bordy et al.(2004) represents a useful contribution to one of the most neglected parts of the Karoo succession, despite its importance in terms of biological and climate change, and evolving basin tectonics. However, the paper also raises a number of issues that warrant further discussion. The paper highlights one of the major problems with the Karoo Basin: the lack of reliable radiometric dates for the age of the basin fill. Bordy et al.(2004) divide the Upper Karoo succession on perceived unconformities which they link to more than twenty year old Ar/Ar dates for synchronous orogenic...

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