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The narrow canyon of the Quebrada el Chorro is carved into the andesite breccia of the Miocene Las Burras-Almagro-El Toro magmatic complex of the Central Andes (El Toro Basin, NW Argentina). Photo by Roberto Mazzuoli. See related article by Mazzuoli et al. (v. 120, no. 11/12, p. 1493-1517).