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Within the southern main Karoo Basin, the late Carboniferous to mid-Jurassic Karoo Supergroup of South Africa (Figure 1) represents a 12-km thick, laterally continuous, clastic sedimentary succession that was deposited in a retro-arc foreland setting in response to subduction and accretionary tectonics along the southwest margin of Gondwana (Johnson et al., 1996(Johnson et al., , 2006. During the Permian, an interplay between regional tectonics, an icehouse to greenhouse climatic transition, and a marine incursion resulted in deepening of the southern main Karoo Basin and deposition of the Ecca Group (Catuneanu et al., 2002;Cole, 1992).The Ecca Group is well documented in the southwest section of the basin in terms of lithostratigraphy (

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