Having an accurate time scale is a crucial aspect of reconstructing how anatomical and behavioral characteristics of early hominids evolved. Relative dating methods allow one to determine if an object is earlier than, later than, or contemporary with some other object. It does not, however, allow one to independently assign an accurate estimation of the age of an object as expressed in years.
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Often the most precise and reliable chronometric dates come from written records. The ancient Maya Indian writing from Central America shown here is an example. The earliest evidence of writing anywhere in the world only goes back about years.
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