BIOL 1209 Chapter : 20140425 123520
Document Summary
Holocene new found fossils compared to other fossils of known age. Principle of superposition- younger = closer to surface. Chronometric- aka absoulte age based on radioactive decay. Half life- time till radioactive element loses half of its energy. The segregation/combination of land explains geographical distribution of early primates ex: only lemurs in madagascar. Evolution of early primates/hominoids: america ; europe. Eocine (56 mya: america; europe more modern looking. Two major lineages some were diurnal, some nocturnal varied diet, no toothcomb. Fayom, egypt (this was a tropical forest at the time) Propliopithecus: dental formula 2,1,2,3 (same as modern catarrhines : ow monkeys, apes, humans) Parapithecus: dental formula 2,1,3,3 (same as modern platyrrhines : nw monkeys) Africa was an island in the early miocene, but migration became possible around 16 mya. Sivipithecus, kenyapithecus, afropithecus large molars / thick enamel / thick mandible nut and seed diet.
