▁the ▁reconst ruction ▁of ▁Rog ers ▁ 1 9 9 3 , ▁ 1 9 9 6 ▁the ▁oldest ▁continent ▁is ▁Ur . ▁In ▁Rog ers ' ▁reconst ru ctions , ▁however , ▁Ka ap va al ▁and ▁Pil bara ▁are ▁placed ▁far ▁apart ▁already ▁in ▁their ▁G ond w ana ▁configuration , ▁a ▁reconst ruction ▁contrad icted ▁by ▁later ▁or ogen ic ▁events ▁and ▁in compatible ▁with ▁the ▁Va al bara ▁hypothesis . ▁ ▁, ▁never theless , ▁found ▁a ▁three - fold ▁strat ig raph ic ▁similarity ▁and ▁proposed ▁that ▁the ▁two ▁cr at ons ▁once ▁formed ▁a ▁continent ▁which ▁he ▁named ▁Va al bara . ▁ ▁This ▁model ▁is ▁supported ▁by ▁the ▁p ala e om agnet ic ▁data ▁of ▁. ▁Re const ru ctions ▁of ▁the ▁p ala e ol at itudes ▁of ▁the ▁two ▁cr at ons ▁at ▁ 2 . 7 8 – 2 . 7 7   G a ▁are ▁ambigu ous ▁however . ▁ ▁In ▁the ▁reconst ruction ▁of ▁ ▁they ▁fail ▁to ▁overlap , ▁but ▁they ▁do ▁in ▁more ▁recent ▁reconst ru ctions , ▁for ▁example ▁. ▁ ▁Other ▁scient ists ▁dispute ▁the ▁existence ▁of ▁Va al bara ▁and ▁explain ▁similar ities ▁between ▁the ▁two ▁cr at ons ▁as ▁the ▁product ▁of ▁global ▁processes . ▁ ▁They ▁point ▁to , ▁for ▁example , ▁thick ▁vol can ic ▁depos its ▁on ▁other ▁cr at ons ▁such ▁as ▁Ama z onia , ▁São ▁Francisco , ▁and ▁K arn ata ka . ▁ ▁Z img arn ,