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Unknown titlecultural layers in the cave. | Photo Credit: Devlin A. Gandy/ www.joh.cam.ac.uk The research also implicated humans in the extinctions of many large Ice Age mammals such as mammoths and camels. <span>Stone tools unearthed in a cave in central Mexico and other evidence from 42 far-flung archeological sites indicate people arrived in North America earlier than previously known, upwards of 30,000 years ago. Scientists said on Wednesday they had found 1,930 limestone tools, including small flakes and fine blades that may have been used for cutting meat and small points that may have been us
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