Fig. 4

Santiago Roth (in a seated posture), presumably in the vicinity of Pergamino, Buenos Aires Province (Weigelt, 1951). Some sources indicate that the person standing might be François Machon, but this is unlikely, as is the report that this picture was taken during explorations in Patagonia of 1892. The photo may instead depict Roth working on a carapace of Glyptodon aided by a laborer in Pergamino in 1890 (Weigelt, 1951)