Larson and Michaelsen (1990) suggest that Virgin Anasazi cultural development can be explained as a response to population growth and climatic variation. They present demographic and climatic data to argue that abandonment of the Virgin Anasazi region was a response to a severe mid-twelfth century drought. Reconsideration of their data shows that Virgin Anasazi populations probably did not grow or decline as rapidly as they suggest. Further, radiocarbon dates suggest that the Virgin Anasazi occupied the area until the late thirteenth century. The Virgin Anasazi abandonment did not coincide with the twelfth-century drought, and cannot be explained solely by reference to population size and climatic change.