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Neil M. Judd

Zunis watching the sunset from Pueblo Bonito.

A diagram of Pueblo Bonito, outlining the expedition's excavations.

Archeologists remove unstable stones before excavating Pueblo Bonito.

An excavated fireplace and ceremonial entrance at Pueblo Bonito.

The excavated southeast section of Pueblo Bonito.

Chaco Canyon National Monument. Frank A. Thackeray, C.S. Scofield and W.H. Jackson, surrounded by Zuni and Navajo workmen at Pueblo Bonito Camp, just prior to departure following agricultural symposium. New Mexico.

A surveyor maps Chaco Canyon while standing on a cliff.

National Geographic partnered with the Smithsonian in the 1920s for the multi-year excavation of Pueblo Bonito, Chaco Canyon National Monument’s most important ruin. The important technique of dendrochronology, which dates archaeological features using tree rings, was refined during the project.