According to a new study published in the Journal of Archaeological Science: Reports, the ancient inhabitants of Chaco Canyon likely had to import corn to feed the multitudes residing there.

The study, by University of Colorado Boulder researcher Larry Benson, shows that New Mexico’s Chaco Canyon had soils that were too salty for the effective growth of corn and beans.

“The important thing about this study is that it demonstrates you can’t grow great quantities of corn in the Chaco valley floor,” Dr. Benson explained.

“And you couldn’t grow sufficient corn in the side canyon tributaries of Chaco that would have been necessary to feed several thousand people.”

“Either there were very few people living in Chaco Canyon, or corn was imported there.”

Between the 9th and 12th centuries, Chaco Canyon was the focus of an unprecedented construction effort.

At the height of its cultural heyday, 12 stone masonry ‘great houses’ and other structures were built there, along with a network of ceremonial roads linking Chaco with other Pueblo sites in the Southwest.

As part of the study, Dr. Benson used a tree ring data set created by Prof. Jeff Dean of the University of Arizona that showed annual Chaco Canyon precipitation spanning 1,100 years.

The tree rings indicate the minimum amount of annual precipitation necessary to grow corn was exceeded only 2.5% of the time during that time period.

Dr. Benson suggests that much of the corn consumed by the ancient people of Chaco may have come from the Chuska Slope, the eastern flank of the Chuska Mountains some 50 miles west of Chaco Canyon that also was the source of some 200,000 timbers used to shore up Chaco Canyon masonry structures.

“Between 11,000 and 17,000 Pueblo people are thought to have resided on the Chuska Slope prior to 1130 CE,” the researcher said.

“Winter snows in the Chuska Mountains would have produced a significant amount of spring snowmelt that was combined with surface water features like natural ‘wash systems.’ Water concentrated and conveyed by washes would have allowed for the diversion of surface water to irrigate large corn fields on the Chuska Slope.”

“The Chaco Canyon inhabitants traded regularly with the Chuska Slope residents, as evidenced by stone tool material (chert), pottery and wooden beams.”

“There were timbers, pottery and chert coming from the Chuska region to Chaco Canyon, so why not surplus corn?”

Many archaeologists are still puzzled as to why Chaco Canyon was built in an area that has long winters, marginal rainfall and short growing seasons.

“I don’t think anyone understands why it existed. There was no time in the past when Chaco Canyon was a Garden of Eden,” Dr. Benson said.

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Larry Benson et al. The Chuska Slope as an agricultural alternative to Chaco Canyon: A rebuttal of Tankersley et al. Journal of Archaeological Science: Reports, published online December 2, 2016; doi: 10.1016/j.jasrep.2016.10.017