In a recent article, Pazos et al. (2008, p. 343) claim that ‘the Zanja del Tigre Formation (Uruguay) represents a glacial influenced succession deposited during the Neoproterozoic, correlative with one of the glaciations described in the Kalahari Craton, prior to Kalahari–Río de la Plata assembly in the proto-western Gondwana margin'. However, we question the two lines of evidence that Pazos et al. (2008) put forth in their paper to constrain the age of this unit and to support a glacial event.

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Pazos et al. (2008, p. 350, and fig. 4) consider the Zanja del...

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