Sempere challenges recent geologic mapping and structural interpretations in the Eastern Cordillera of southern Bolivia (Horton, 1998), noting differences from previous studies (Hérail et al., 1996; Tawackoli et al., 1996; Kley et al., 1997). He particularly questions the interpretation of a thin-skinned thrust system. As an alternative, he proposes that a reactivated crustal-scale vertical fault is of primary importance in the Cenozoic tectonic history of the region. I welcome the opportunity to review the map relationships, synorogenic sedimentary record, and new interpretation.

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First, I present stratigraphic separation diagrams for the major contractional faults in...

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