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The sub-Andean foreland basin of southern Bolivia chronicles erosional unroofing of the central Andean fold-thrust belt during Cenozoic shortening. Analyses of five stratigraphic sections document regional paleosol development in forebulge to distal foredeep depozones, followed by proximal accumulation of a greater than 4 km (2.5 mi) thick upward coarsening and thickening succession of mixed fluvial to megafan deposits. New timing constraints from zircon U-Pb ages for sandstones and interbedded volcanic horizons indicate Oligocene to late Miocene facies migration and eastward progradation from growing structures and point sources of sediment. Detrital zircon U-Pb results, sandstone/conglomerate compositions, and paleocurrent data reveal...

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