Abstract

UNTIL very recently, the most perplexing mystery of Southwestern archeology -- what caused the collapse of the ancient empire of the Anasazi -- seemed all but solved. Careful scrutiny of tree-ring records seemed to establish that in the late 1200's a prolonged dry spell called the Great Drought drove these people, the ancestors of today's pueblo Indians, to abandon their magnificent stone villages at Mesa Verde and elsewhere on the Colorado Plateau, never to return again