For our purposes then any archaic individual judged

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Unformatted text preview: own children reach age 15 and reproduce. For our purposes, then, any archaic individual judged to be 30 years old or more qualified as an older adult—one old enough to have become a grandparent. But the beauty of the OY ratio approach is that regardless of whether maturation occurred at 10, 15 or 20 years, the number of older and younger individuals in a sample would be unaffected because the start of older adulthood would change accordingly. And because we were only looking to place the fossils in these two broad categories, we could include large numbers of smaller fossil samples in our analysis without worrying about uncertainties in absolute ages. We calculated the OY ratios for four large aggregates of fossil samples totaling 768 individuals spanning a period of three million years. One aggregate comprised later australopithecines—those primitive relatives of “Lucy,” who lived in East Africa and South Africa from three million to 1.5 million years ago. Another aggregate consisted of early members of our genus, Homo, from around the globe...
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This note was uploaded on 02/20/2013 for the course ANTH 101 taught by Professor Roseman during the Spring '12 term at University of Illinois, Urbana Champaign.

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