In the Tupiza area of southern Bolivia, Cenozoic strata are outstandingly exposed in five north-trending basins. Because they could yield important information on the local Andean tectonic development, these basins were independently studied by Hérail et al. (1996), by a German group (Tawackoli et al., 1996; Kley et al., 1997; Tawackoli, 1997), and by Horton (1998). Geological maps by Hérail et al. and by Kley et al. agree fairly well (Fig. 1), and both studies recognize that west-vergent contraction has been dominant. According to Hérail et al., the area is a thin-skinned...

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