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Barton, E. S. and Altermann, Wladyslaw and Williams, I. S. and Smith, C. B. (1994): U-Pb zircon age for a tuff in the Campbell Group, Griqualand West Sequence, South Africa. Implications for early Proterozoic rock accumulation rates. In: Geology, Vol. 22, No. 4: pp. 343-346