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Anthropology 100 Lecture Notes 4

Anthropology 100 Lecture Notes 4 - Haylee Davis...

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Haylee Davis Anthropology 100 Lecture Notes #4 Miocene *Apes first evolved during Miocene -have lack of tail (differentiated from other mammals) -Apes outnumbered monkeys, ape evolution took off -8 mya-5mya (emergence of hominins) – end of Miocene -East Africa -sites in Rift Valley, where two of the earth’s tectonic plates have been moving apart for 20 million years -all sites occur within the rift valley (volcanic activity, eroding) –covering up fossil sites -open air sites -oldest sediments on bottom, newest on top -record is much older in East Africa -much more reliable dates (absolute dates) -South Africa -sites preserved in underground dolomitic caves -underground cave sites -ending up in caves by accident, did not live there -record is more recent -less reliable dates *Hominins were not limited to these areas (reasons we don’t have fossilts in other parts is that there were bad preservation environments)-east and central -they could have lived there -depositional contact -Earliest hominin fossils come from East Africa, including Ardipithecus (from Ethiopia), Orrorin (from Kenya), and Sahelanthropus (from Chad) -5-7 mya (links Humans and Chimpanzees) –lineage, common ancestor -all being similarly adapted 1. Earliest hominins we know of
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