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Comments on the papers by Bailie et al. concerning the age and deposition of the Bushmanland Group (South African Journal of Geology, 110, 59–86) and single zircon ages of the Aggeneys Granite Suite (South African Journal of Geology, 110, 87–110)

Department of Geology, University of the Free State, Bloemfontein, South Africa, e-mail: CollisWP.sci@ufs.ac.za; aesc@iafrica.com; PraekeltHE.sci@ufs.ac.za

The first 20% of the full text of this article appears below.

The authors of the two papers fulfill a long-felt need for accurate isotopic data on the Bushmanland Group and the contiguous granitic gneisses, not to mention a wealth of new geochemical analyses. The samples that were used, were collected in the eighties by Lipson (reported in a thesis, 1990) and by Duncan et al. (provided in an unpublished report, 1985). We much appreciate the new data but believe that the stratigraphic sampling context is fundamentally flawed, constraining the interpretation of analytical results.

The stratigraphic framework that we prefer is based on detailed as well as regional sequence and structural mapping, elucidated in several previous publications (Strydom et al., 1987; Colliston et al., 1986; 1989. . . [Full Text of this Article]