c. 2005 - 1920 Ma . Kimban Orogeny, Gawler craton in Australian Continent begins. asteroid impacts. Much First complex single-celled life : protists with nuclei. Columbia is the primordial supercontinent. Kimban Orogeny in Australian Continent ends. Yapungku Orogeny on North Yilgarn craton , in Western Australia . Mangaroon Orogeny, 1680-1620 Ma