 Finding that the local Hohokam red-on-buff pottery artifacts were mixed with polychromes of the Salado Culture, Gladwin wondered how and why the two distinctive pottery types were together with no evidence for conflict between the Hohokam cultures of the Gila Basin and the Salado cultures of the Tonto Basin.Gladwin's excavations in southern Arizona helped to renew an interest in this area that had been nearly forgotten since Frank Cushing had done his own excavations there in the late nineteenth century.In 1928, Harold and his future wife, Winifred, founded the Gila Pueblo Archaeological Foundation over the remains of a pueblo that the two had excavated together.