Fig. 9

Simplified diagram showing river drainage basins and source terranes, which contributed detrital zircons to the Barra del Tordo and Tesoro beaches in the northwestern Gulf of Mexico. The longshore current illustrations are after Monreal-Gómez et al. (1992). Source rocks are inferred through the zircon U − Pb ages compiled from Weber et al. (2010), Zavala-Monsiváis et al. (2012), Lawton and Molina-Garza (2014), Escalona-Alcázar et al. (2016), Silva-Romo et al. (2018), Juárez-Arriaga et al. (2019), Sieck et al. (2019), Barboza-Gudiño et al. (2020), and Vega-Granillo et al. (2020). SC: San Carlos; ST: Sierra de Tamaulipas; TTA: Tlanchinol−Tantima−Alamo; VH: Valle de Huizachal