The discussion by Turner and Thomson raises a number of interesting points which we feel required greater clarity, and presents certain statements which in truth are not hard and fast facts. A number of the criticisms levelled at the basin development paper of Bordy et al. (2004a) are based on Turner’s belief in a transient hypothetical plume model for the development of the main Karoo Basin during the Triassic to Early Jurassic (Turner, 1999). While space precludes a full discussion on the flaws of this model as addressed by Hancox et al. (2002), and which will be...

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