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Basins around the margin of the Puna Plateau in NW Argentina each record the onset over a few hundred thousand years of alluvial-fan facies sedimentation with the deposition of the Punaschotter conglomerates in the late Cenozoic, despite differing tectonic histories. Their striking similarity suggests that these conglomerates might have a common origin, such as the climatically driven coarsening and increase in sedimentation rate proposed to have occurred worldwide at 4–2 Ma. With this contribution, we present new U-Pb geochronology of intercalated ashes that bracket the onset of Punaschotter deposition along the margin of the Puna Plateau in the Fiambalá and...

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