The construction of the fence along the U.S.-Mexico border in 2007 led to the discovery of a prehistoric village east of the San Pedro River.

Some of those findings were presented Thursday evening to the Tubac/Santa Cruz County Chapter of the Arizona Archaeological Society.

"The San Pedro is a special place," said archaeologist Maren Hopkins, 27, the project director. She said the village was probably the biggest data-recovery project that she has directed. Hopkins has been digging for 10 years in many places in Arizona, New Mexico and Mexico.

Evidence found at the "Upper San Pedro Village" indicates that it was a crossroads, or a type of "gateway community," said Hopkins, who works for Northland Research Inc., which has offices in Flagstaff, Tempe and Tucson.

"It's sort of an area that's on the periphery of a lot of other areas that we do understand," Hopkins said.

"It's a peripheral site to the Tucson Basin ... it's peripheral to all these areas. So these people were kind of a mix of people. It was frontier then, just like it is now."

The village is believed to have existed from around A.D. 700 to 1200, Hopkins said, based on ceramics analysis. There appear to be some Hohokam characteristics, but it is uncertain who lived there.

Archaeologists found: 23 pit houses, 14 possible pit houses, 97 thermal pits, a number of storage pits, five dog burials and 69 human burials. As is customary in this region, the human remains have been repatriated to the Tohono O'Odham Indian Reservation.

There was an interesting artifact found at the site that Hopkins had not seen before. She calls it a "stone jaw bone." It has a serrated edge, and she believes that it was used for scraping animal hides. Several of these implements were found at the site, which also yielded "more deer bone than I've ever seen in my life," she said.

Northland was contracted to do archaeological work for the U.S. Corps of Army Engineers and the U.S. Department Homeland Security so that they could comply with federal archaeological laws. In October 2007, Homeland Security Secretary Michael Chertoff pushed ahead with the fence, winning federal court approval of the waiving of environmental restrictions.

"It is a sensitive subject," Hopkins said of the border politics.

She told the Tubac archaeology society how complicated her work was, because of the numerous government and private agencies involved. Those included ranchers on the U.S. and Mexico side, the U.S. Bureau of Land Management, U.S. Fish and Wildlife and the Arizona National Guard, just to name a few.

She described how one time "the No. 2 guy" from Homeland Security flew to the San Pedro River archaeological site in a Black Hawk helicopter and asked the scientists, "Are you OK?" Some of the nearby Mexican ranchers were delivering tacos, which the archaeologists had become accustomed to. The Homeland Security official asked, "Are they bugging you?" The archaeologists answered, "No."

Hopkins said there was genuine concern for archaeologists' safety when they were working in another site along the border. She was referring to the violent smuggling corridor of Altar Valley, Ariz.

Overall, the archaeologists dealt with multiple jurisdictions and a lot of curious people.

" ... we just had people around us all the time," she said.

Mexican archaeologists were among the interested parties, and their American counterparts are collaborating with them, Hopkins said.

One restriction posed by the U.S. government was that the archaeologists could only dig 5 feet deep, because that was as far as they were digging for the fence's footers. Below that depth, "The archaeology, I guarantee, keeps going," Hopkins said.

On another axis, the archaeologists were allowed to dig to a limit of 60 feet wide. That dimension related to President Theodore Roosevelt's 60-foot-wide easement running the length of the U.S.-Mexico border from California to Texas. The "Roosevelt Reservation" was created "for the purpose of homeland security," Hopkins said.

This "stripping" method of archaeology, done mainly by backhoe, extended for 0.3 miles and excavated 7,500 tons of soil from 0.75 acres.

The site has been reburied. Hopkins has not been back for many months.

"There's a fence there now," she said.

(Ted Morris works for The International's sister newspapers Sierra Vista Herald and Bisbee Daily Review. He can be reached at (520) 515-4614 or by e-mail at cityeditor@svherald.com.)