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It doesn't mean they didn't have them, but we don't have a definitive answer." Homo erectus is considered to be the ancestor species to humans and the first species that left Africa and moved into Asia.

Lake Ohau is one of several very large lakes in the Southern Alps that fill valleys once carved out by huge glaciers during the Ice Age.If the rocks are then buried, the isotopes are no longer produced and those existing begin to decay.The rate of decay can tell researchers when the rocks were deposited in a site, he said.Granger used aluminum-26 and beryllium-10 radioisotopic dating, which is based on radioactive decay in the mineral quartz.As cosmic rays penetrate into rocks at the Earth's surface, chemical reactions produce these isotopes of aluminum and beryllium.Darryl Granger, the Purdue professor of earth and atmospheric sciences who developed the dating method, co-led the study with Guanjun Shen of China's Nanjing Normal University.They analyzed four stone tools and six sediment samples from the site.The research team had difficulties in separating quartz from the sediment samples, and Shen and Gao got their entire department in on the work, Granger said.The sediment contained about 1 percent quartz, and the dating method requires pure white quartz.This method provides a new tool to provide insight into places where dating was previously limited." Susan C.Antón, associate professor in the Center for the Study of Human Origins at New York University said this discovery indicates "Peking Man" was somehow behaviorally able to cope with the cold environment."This was the first dating of this kind to be used in an early hominid site in China," Granger said."Many of the existing data methods rely on the availability of volcanic rock, which the Zhoukoudian site does not have."They ended up hand separating these bits of quartz the size of grains of sand," he said."It took about eight hours to separate 2 grams of the pure white quartz needed, and each sample required 40 to 60 grams.

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