Abstract
This article summarizes recent work at the site of Las Chachalacas, located in the Municipio of Quiriego, southern Sonora. Set within the western foothills of the Sierra Madre Occidental, Las Chachalacas was adjacent to an arroyo that periodically became impounded, producing a marsh like environment. Stratigraphic associations and a minimal number of 14C dates suggest the site was regularly utilized from the terminal Pleistocene through the Early Agricultural period. Results contribute to several enduring debates in the North American Southwest regarding Pleistocene landscape use, demographic continuity through the Holocene Climatic Optimum (7500–5000 cal BP), the sequence of mobility and subsistence changes in the Archaic/Early Agricultural periods, and the identities of the earliest farmers indexed by material culture such as projectile points.
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