Dendrochronology
After becoming increasingly uncomfortable with Cummings' perspective on archaeology Haury looked for other opportunities. In 1929 he began to work for A. E. Douglass. It was in 1929 along with Douglass and several other archaeologists that a tree ring sample was uncovered in Show Low, Arizona. It was this tree ring which helped in establishing a missing link in the ability to use tree rings as dating markers, and was the watershed moment in dendrochronology. This discovery then allowed for archaeological sites in the Southwest to be more accurately dated.
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