GGR100H1 Lecture Notes - Lecture 5: Laetoli, Biotic Material, Geochronology
Document Summary
3,8000 mya from single celled organism to anatom. The quaternary period divided into two epochs. Plio-plesitocene boundary contrast with miocene epoch (23. 5-5. 3) mya. Alternating global periods characterized by dry and cold condition. And expansion of ice sheets and glaciers. Based on cal sites found in marine fauna and shells. Marine isotope stages (2. 6-0l. 012 mya) also shows paleomagnetism record. Example from utah: most of the pleistocene: matuyama (reversed, followed by bruhnes (normal, minor reversals. Movement of liquid in outer core generates magnetic field. Called geo dynamo pattern (causes changes in orientation in poles) Onset of the pleistocene to the rise of the homo genus roughly 2. 6- Mostly in the same are of savannah and grasslands two major varieties: austrolopithecus and paranthropus. East africa robust large wide face saggital crest. Eating rough material that is hard to digest. Onset of the pleistocene to the rise of genus homo roughly 2. 0-0. 7 mya. Oldiwan tool industry first member of our genus.
