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Reply to comments by W.P. Colliston, A.E. Schoch and H.E. Praekelt on our paper on metasediments from the Areachap and Kakamas Terranes and the stratigraphic integrity of the Areachap Group. (SAJG, 110, 575–584 (2007)

Institute for Earth Sciences, University of Gothenburg, Box 460, SE-405 30 Göteborg, Sweden. email: cornell@gvc.gu.se; asaporfyr@hotmail.com

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We thank Colliston and co-authors for their comments on our paper and applaud their effort to start a debate about the tectonostratigraphic subdivision of the Namaqua-Natal Province. We think that it is important to debate the geological and scientific issues, rather than to follow Monty Python in a ‘we are right and you are wrong’ type of argument.

In our work we try to follow established scientific practise by taking into account previously published work and not changing established nomenclature without good reasons, preferably described in peer-reviewed publications. In our paper we have not discussed the regional picture, but follow the subdivision which was described in some detail in the review article of Thomas et al.(1994a), summarised for the South African geological community by Thomas et al.(1994b), and used as a framework in the epic textbook chapter by Cornell et al.(2006). Much of the nomenclature in this subdivision comes from the pioneering work of Hartnady et al. (1985) who proposed names for several terranes (e.g. Kakamas) and subprovinces (e.g. Richtersveld, Bushmanaland) in what we now call the Namaqua Sector of the Namaqua-Natal Province. Refinements of their rather vague boundaries south of Upington were based on the recognition of the Areachap Group as a juvenile volcanic arc during the Collaborative Science Programme and the paper on the Areachap Group by . . . [Full Text of this Article]