Archaeological survey of Chihuahua, Mexico to determine the culture groups that may have inhabited or influenced the development of culture in the area.
Critical analysis of similarities and differences in various tree-ring data obtained from the Tusayan Ruin in an attempt reach a consensus as to the date of the ruins in the region.
Based on geological reconnaissance of the Elm Creek silts, Dr. Leighton concludes that primitive man may have inhabited the area around Abilene Texas during the Wisconsin glacial stage.
A survey to the north along the Mogollon Rim and Verde Valley using ruins and sherds to identify distinct cultures- signs of their origins and entry into the region.