World History Timelines for UPSC exam ( 4.5 billion – 1 B.C. World History )
4.5 billion – 1 B.C. World History Before Christ (B.C.) or Before the Common Era (B.C.E.) 4.5 billion B.C. Planet Earth formed. 3 billion B.C. First signs of primeval life (bacteria and blue-green algae) appear in oceans. 600 million B.C. Earliest date to which fossils can be traced. 4.4 million B.C. Earliest known hominid fossils ( Ardipithecus ramidus ) found in Aramis, Ethiopia, 1994. 4.2 million B.C. Australopithecus anamnesis found in Lake Turkana, Kenya, 1995. 3.2 million B.C. Australopithecus afarenis (nicknamed “Lucy”) found in Ethiopia, 1974. 2.5 million B.C. Homo habilis (“Skillful Man”). First brain expansion; is believed to have used stone tools. 1.8 million B.C. Homo Erectus (“Upright Man”). Brain size twice that of Australopithecine species. 1.7 million B.C. Homo Erectus leaves Africa. 100,000 B.C. Fi...