![]() ![]() ![]() ![]() When he realized that the rings of trees in the same area all had the same patterns, he decided to use them as a record of the area’s historical climate.ĭouglass eventually extended his work from living trees to wood used in ancient pueblo sites and began using them to piece together a regional chronology that could be used to date such archaeological sites. In the early 20th century, astronomer Andrew Ellicott Douglass began studying trees in the American Southwest to learn more about how sunspots affected climate on Earth.
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