Guevavi was a major focus of missionization efforts among the Sobaipuri-O'odham. We think we have identified the 1751 Jesuit mission among six adobe structures that surround the recognized NPS mission. I will date each with adobe wall samples using the luminescence technique. This will inform on which of these adobe structures date to (a) the Kino period (1691-1711), (b) 1751, (c) which are Franciscan, or (d) later mining/ranching features.