Oshara Tradition, the northern tradition of the Picosa culture, was a Southwestern Archaic Tradition centered in New Mexico and Colorado.  Cynthia Irwin-Williams, developed the sequence of Archaic culture for Oshara during her work in the Arroyo Cuervo area of northwestern New Mexico. Irwin contends that the Ancestral Puebloans developed, at least in part, from the Oshara.