Pecoits et al. (2010) question the stratigraphic and glacigenic origins of a tiny section of the Zanja del Tigre Formation that constitutes the least well-constrained of all confirmed and suspected glacial deposits in the Río de La Plata craton (Pazos et al. 2008, 2010).

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Pecoits et al. assert that in the ‘latest compilations of the geology of Uruguay' the Zanja del Tigre Formation is part of the Carapé Group and not the Lavalleja Group. However, this disregards the contemporaneous stratigraphic scheme of Sánchez Bettucci (1998), which includes the Zanja del Tigre Formation in...

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