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Upper Cretaceous-Paleogene strata of northern and central Mexico were deposited in a retroarc foreland basin that was at first narrow but expanded eastward during the Paleogene. New petrographic data and U-Pb detrital zircon ages yield insights into stratirgaphic age of the basin fill, sediment sources, and sediment-dispersal pathways. The basin differs from the contemporary Cordilleran foreland basin of the US to the north in having a dominant volcanic-lithic component in all of its sandstones. Like its northern counterpart, the Mexican basin migrated eastward with time, ahead of an advancing orogenic wedge. Provenance data indicate that the dominant sediment source...

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