Lucy and other members of her species, Australopithecus afarensis, lived between 3.9 and 3.0 million years ago. They are believed to be the most ancient common ancestor, or "stem" species, from which ...
Paleolithic hunters built mammoth traps in what is now Mexico some 14,700 years ago. An unknown sea creature left footprints in sand some 550 million years ago, making them the oldest known footprints ...
Read the chapter in this order: Radioactivity, First Dating of Minerals, Concept of Decay (p. 92-94), Modern Isotopic Dating (p. 94-98), Absolute Measures of Time (p. 91) Modern Relative Time Scale (p ...
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