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Unformatted text preview: co-author of the study and dean of the University of Utah's College of Mines and Earth Sciences. The journal Nature is publishing the study in its Thursday Feb. 17, 2005, issue. Brown conducted the research with geologist and geochronologist Ian McDougall of Australian National University in Canberra, and anthropologist John Fleagle of New York state's Stony Brook University. The researchers dated mineral crystals in volcanic ash layers above and below layers of river sediments that contain the early human bones. They conclude the fossils are much older than a 104,000-year-old volcanic layer and very close in age to a 196,000-year-old layer, says Brown. "These are the oldest well-dated fossils of modern humans ( Homo sapiens) currently known anywhere in the world," the scientists say in a summary of the study....
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