Six million years of savanna: Grasslands, wooded grasslands accompanied human evolution

Wednesday, August 3, 2011 - 14:31 in Paleontology & Archaeology

Scientists have used chemical isotopes in ancient soil to measure prehistoric tree cover -- in effect, shade -- and found that grassy, tree-dotted savannas prevailed at most East African sites where human ancestors and their ape relatives evolved during the past 6 million years.

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