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Debate over a single fecal fossil offers a cautionary tale of the interplay between science and culture
As the object of my scientific study, I've chosen coprolites. It's not a common choice, but to a paleonutritionist and archaeoparasitologist, a coprolite-a sample of ancient feces preserved by mineralization or simple drying-is a scientific bonanza. Analysis of coprolites can shed light on both the nutrition of and parasites found in prehistoric cultures. Dietary reconstructions from the analysis of coprolites can inform us about, for example, the origins of modern Native American diabetes. With regard to parasitology coprolites hold information about the ancient emergence and spread of human infectious disease. Most sensational, however, is the recent role of coprolite analysis in debates about cannibalism.
Most Americans know the people who lived on the Colorado Plateau from 1200 B.C. onward as the Anasazi, a Navajo (or Dine) word. The modern Pueblo people in Arizona and New Mexico, who are their direct descendants, prefer the description Ancestral Pueblo or Old Ones. Because the image of this modern culture could be tainted by the characterization of their ancestors, it's especially important that archaeologists and physical anthropologists come to the correct conclusion about cannibalism. This is the story of my involvement in that effort.
When a coprolite arrived in my laboratory for analysis in 1997, I didn't imagine that it would become one of the most contentious finds in archaeological history. Banks Leonard, the Soil Systems archaeologist who directed excavation of the site at Cowboy Wash, Utah, explained to me that there was evidence of unusual dietary activity by the prehistoric individual who deposited the coprolite. He or she was possibly a cannibal.
I had been aware of the cannibalism controversy for a number of years, and I was interested in evaluating evidence of such activity. But from my scientific perspective, it was simply another sample that would provide a few more data points in my reconstruction of ancient diet from a part of the Ancestral Pueblo region that was unknown to me.
The appearance of the coprolite was unremarkable-in fact, it was actually a little disappointing. It looked like a plain cylinder of tan dirt with no obvious macrofossils or visible dietary inclusions. I have analyzed hundreds of Ancestral and...