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Previous analysis of 87 Sr/ 86 Sr ratios shows that 10th through 12th century Chaco Canyon was provisioned with plant materials that came from more than 75km away. This includes (1) corn (Zea mays) grown on the eastern flanks of the Chuska Mountains and floodplain of the San Juan River to the west and north, and (2) spruce (Picea sp.) and fir (Abies sp.) beams from the crest of the...
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