Oldest known irrigation canals in South America found

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In Peru's Andean foothills a group of archaeologists say they have found remnants of the oldest known irrigation canals in South America, which they hope will provide clues to the origin of the region's agriculturally based societies.

"There are four sites in the area that have canals that date minimally 5,300 years ago, maybe a little earlier," team leader Tom D. Dillehay, an archaeologist at Vanderbilt University in Nashville, Tennessee, told The Associated Press on Tuesday.

Dillehay started his research nearly 30 years ago in the Zana Valley, 37 miles inland from the Pacific Ocean and about 385 miles northwest of Lima.

The conclusions, reported in a recent issue of The Proceedings of the National Academy of Sciences -- a peer reviewed publication of the Washington-based National Academy of Sciences -- offer evidence, long suspected by archaeologists, that irrigation technology was critical to the development of Peru's early civilization, Dillehay said.

"The Zana Valley canals are the earliest known in South America," wrote the authors of the journal article, Dillehay, Herbert H. Eling Jr. of the National Institute of Anthropology and History in Mexico and Jack Rossen of Ithaca College.

Dr. Daniel Morales, director of the school of archaeology at Peru's San Marcos University, said he had not seen the article, but was familiar with Dillehay's work. He said the "discovery of the Zana canals is very important because it could be linked to the first form of irrigated agriculture" in Peru.

Dillehay, in a telephone interview from Chile, said the team first discovered some of the canals and agricultural features in 1985 and dated them for the first time in 1989.

But he said his team waited until now to publish its findings to better understand the hydraulic engineering of the hunters and gatherers who made a historic break from their ancestors to tend "early gardens."

Carbon dating of the four silt-filled canals, buried under sediments, showed that they were used to irrigate cultivated fields about 5,400 years ago, in one case possibly as early as 6,700 years ago, the article said. The team found evidence of domesticated cotton, beans and squash and stone hoe-like tools near the site.

Peru was one of the only places in the world where a complex society flourished, largely independent of outside influence, at the same time the pyramids of Egypt were being built.

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