Provenance analysis and thermochronology of the Chivillas Formation, Mexico: a record of basin formation and inversion in the southern Sierra Madre Oriental during the Early Cretaceous–Palaeogene

Abstract

Road from Azumbilla to Coxcatlán, Puebla (18°35'06''N; 97°14'44''W)Chivillas Formation is characterized by a finning and thinning-upward succession of 1.0-1.5meter-thick quartz-pebble conglomerate with black shale intraclasts and normal gradding. It's followed by a medium to coarse-grained sandstone with planar lamination and laminated black calcareous shale. The succession is cyclic and represents Tad and Tabd Bouma Sequence. Samples RN-3 and RN-4 were collected in this succession, separated by ~2.5 km from each other over the road.