human evolution

Ardipithecus ramidus- 4.4mya Ethiopia spine and jaw begin to resemble humans
Australopithecus anamensis- 4.2mya Lake Turkana, Kenya
Australopithecus afarensis- 3.9-3.0 mya Ethiopia, Kenys, Tanzania
stone tools 2.5 mya simple blades
Homo ergaster 2.5 mya; Caspian sea 1.7 mya

notes from Zimmer, Evolution: the Triumph of an idea