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Integrated biostratigraphy, sedimentology, and stable isotopes of 11 outcrops and wells along the Brazos River of Falls County, Texas, U.S.A., reveal the stratigraphic separation and sequential depositional history of the Chicxulub impact, followed by the sandstone complex and associated sea-level fall, which in turn was followed by the Cretaceous–Tertiary boundary (KTB). The KTB was identified up to 1 m above the sandstone complex based on three global standard criteria: the mass extinction in planktic foraminifera, evolution of first Danian species, and negative δ13C shift. No Ir anomaly is associated with the KTB or the Chicxulub impact ejecta...

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