▁zones ▁finally ▁separated ▁Gr une h og na ▁and ▁the ▁rest ▁of ▁Ant arct ica ▁from ▁Africa . ▁In ▁the ▁Ann and ags ▁Pe aks , ▁the ▁only ▁exposed ▁parts ▁of ▁Gr une h og na , ▁det rit al ▁z ir cons ▁from ▁several ▁cr ust al ▁sources ▁have ▁been ▁dated ▁to ▁ 3 . 9 – 3 . 0   G a ▁suggesting ▁int rac rust al ▁rec y cling ▁was ▁an ▁important ▁part ▁in ▁the ▁formation ▁of ▁the ▁first ▁cr at ons . ▁ ▁The ▁Ka ap va al ▁cr aton ▁is ▁marked ▁by ▁dram atic ▁events ▁such ▁as ▁the ▁intr usion ▁of ▁the ▁Bush vel d ▁Complex ▁( 2 . 0 4 5   G a ) ▁and ▁the ▁V re def ort ▁impact ▁event ▁( 2 . 0 2 5   G a ), ▁and ▁no ▁traces ▁of ▁these ▁events ▁have ▁been ▁found ▁in ▁the ▁Pil bara ▁cr aton , ▁clearly ▁indicating ▁that ▁the ▁two ▁cr at ons ▁were ▁separated ▁before ▁ 2 . 0 5   G a . ▁ ▁Furthermore , ▁ge och ron ological ▁and ▁p ala e om agnet ic ▁evidence ▁show ▁that ▁the ▁two ▁cr at ons ▁had ▁a ▁rot ational ▁ 3 0 ° ▁lat itud inal ▁separation ▁in ▁the ▁time ▁period ▁of ▁ 2 . 7 8 – 2 . 7 7   G a , ▁which ▁indicates ▁they ▁were ▁no ▁longer ▁joined ▁after ▁c . ▁ 2 . 8 ▁billion ▁years ▁ago . ▁ ▁Va al bara ▁thus ▁remained ▁stable