Praekelt et al. (2008) add important data concerning the sedimentology of the Cango Caves Group, a critical sedimentary succession of Neoproterozoic age in southern South Africa. They discuss an unconformity in its lower part (between the Kombuis Member of the Matjies River Formation and the Groenefontein Formation) as being a sub-aerial karst surface and argue that this contact is related to glacial processes. Therefore, it is claimed that the unconformity can be used as a correlation horizon on regional scale. Besides the importance of correlation of sedimentary succession, this specific exercise by Praekelt et al. (2008) is part of the...

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