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 (provided in an unpublished report, 1985).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...

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