ARCH 131 Lecture Notes - Lecture 7: East African Rift, Olduvai Gorge, Koobi Fora
17 Apr 2016
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Takemillions of ytears to form, then sediments start to accumulate. Calcium carbonate cements the hole, makes the rock very hard called breccia. Two tectonic plates moving apart which create a rit. If u ind a hominin skull, look at the layers of ash (above and below) to get a date. Mary leakey found a series of hominim footsteps on top of volcanic ash. Oldest known stone tools, dated to 2. 6 mya. Plesiomorphic traits: primiive traits or characterisics inherited by a species because their common ancestors had it. The irst appear in the species in quesion. The need to decide: just another example of something we"ve already found, or is it a new species, or is it a new genus. Phylogeny refers to the actual evoluionary relaionships between diferent organisms. Dna degrades in heat, so usually none in africa. Dna is preserved high up or in caves. Very large cheek teeth (molars: bigger than chimp.
