José Solas Ruin was investigated in 1951 by Charles C. Di Peso of the Amerind Foundation. Di Peso identified the site as the Protohistoric period Sobaipuri (Piman) settlement of San Salvador de Baicatcan, thereby, he argued, closing “the gap” between the archaeological and historical records in southeastern Arizona. Critics have long maintained that Di Peso’s dating of the site is erroneous. Recent research has revealed that the component excavated by Di Peso was actually built and inhabited by ancient immigrants from northern Arizona between A.D. 1300 and 1375, like the nearby Reeve Ruin and Davis Ranch site. The absence of a protohistoric occupation removes from consideration one of the few sites that might possibly have spanned the pre-Hispanic/Hispanic period transition in southern Arizona and has important implications for models of regional cultural continuity.
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