National Geographic : 1936 Jan
Photograph by O.C.Havens A PANORAMIC VIEW OF PUEBLO BONITO, EXCAVATED BY NATIONAL GEOGRAPHICSOCIETY EXPEDITIONS These ruins, set apart as the Chaco Canyon National Monument by President Theodore Roosevelt, are theoldest definitely dated major pueblo remains in the American Southwest. The colossal communal dwelling was under construction 919 A. D . and the settlement had reached itsheyday in1067. The Society's Pueblo Bonito expeditions and another series not only discovered the date of this prehistoric apartment-house metropolis oftheaboriginal South west, but also developed a tree-ring calendar which dated more than 40 other major pueblo dwellings (see "Everyday Life inPueblo Bonito," byNeil M. Judd, in the NATIONAL GEOGRAPHIC MAGAZINE for September, 1925, and "The Secret of the Southwest Solved byTalkative Tree Rings," byAndrew Ellicott Douglass, December, 1929).