Abstract

The Zacoalco-Sayula basin is situated near Guadalajara, Jalisco, Mexico. It represents the westernmost enclosed-drainage basin located in the Mexican Volcanic Belt. The region is famous for its paleontological deposits with a remarkable Pleistocene component. The Regional Museum of Guadalajara has among its collections, bone and lithic artifacts belonging to the paleoindian period, the majority reported to have been collected in the fossil gravels of the beaches of Zacoalco- Sayula. The Zacoalco-Sayula Pilot Project 1983(ZSPP)directed by R. Forbis and M. Aliphat, carried out seminal research on the geology, geomorphology, botany and archaeology of the possible context of previous finds (faunal and artifacts), through an interdisciplinary approach that helped to define potential localities for further research and excavation.