Ever since Slawson (1976) suggested that the Archaean crystalline basement rocks in the core of the Vredefort dome southwest of Johannesburg might represent “crust-on-edge”, debate has existed about the extent to which the deep crust was exhumed by the ~2.02 Ga, impact-induced doming event. In a suite of papers since 1981, Hart and co-workers (Hart et al., 1981; 1990a; b; 2004; De Wit et al., 1992; Tredoux et al., 1999; Moser et al., 2001; Flowers et al., 2003) postulated that doming (and subsequent erosion) exposed a...

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