In their comments, Keller et al. report three to four spherule layers in the La Sierrita area in the late Maastrichtian Méndez Formation and interpret them to be one or more latest Maastrichtian impact events, or a pre–Cretaceous-Tertiary (K-T) impact, followed by repeated reworking of the original spherule deposits (Stinnesbeck et al., 2001). They state that their interpretation is based on the study of 37 sections. However, this is a fallacious argument that is based on the authority status of the authors, because they have only published two sections at Loma Cerca and Mesa Juan Pérez. The latter...

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