▁from ▁proto - cont in ents ▁and ▁was ▁a ▁super cont inent ▁ 3 . 6 3 6 ▁billion ▁years ▁ago . ▁Va al bara ▁broke ▁up ▁c . ▁ 2 . 8 4 5 – 2 . 8 0 3 ▁Ga ▁ago . ▁The ▁super cont inent ▁Ken or land ▁was ▁formed ▁c . ▁ 2 . 7 2 ▁Ga ▁ago ▁and ▁then ▁broke ▁som etime ▁after ▁ 2 . 4 5 – 2 . 1 ▁Ga ▁into ▁the ▁proto - cont inent ▁cr at ons ▁called ▁Laurent ia , ▁Balt ica , ▁Y il g arn ▁cr aton , ▁and ▁Kal ah ari . ▁The ▁super cont inent ▁Columbia ▁or ▁N una ▁formed ▁ 2 . 0 6 – 1 . 8 2 ▁billion ▁years ▁ago ▁and ▁broke ▁up ▁about ▁ 1 . 5 – 1 . 3 5 ▁billion ▁years ▁ago . ▁The ▁super cont inent ▁Rod in ia ▁is ▁thought ▁to ▁have ▁formed ▁about ▁ 1 . 1 3 – 1 . 0 7 1 ▁billion ▁years ▁ago , ▁to ▁have ▁emb od ied ▁most ▁or ▁all ▁of ▁Earth ' s ▁contin ents ▁and ▁to ▁have ▁broken ▁up ▁into ▁eight ▁contin ents ▁around ▁ 7 5 0 – 6 0 0 ▁million ▁years ▁ago . ▁ ▁See ▁also ▁ ▁References ▁ ▁Further ▁reading ▁ ▁Valley , ▁John ▁W ., ▁William ▁H . ▁Pe ck , ▁Elizabeth ▁M . ▁King ▁( 1 9 9 9 ) ▁Z ir cons ▁Are ▁Fore ver , ▁The ▁Out c rop ▁for ▁ 1