known ▁terrest rial ▁impact ▁products . ▁The ▁spher ules ▁res emble ▁the ▁glass y ▁ch ond rules ▁( r ounded ▁gran ules ) ▁in ▁carbon ace ous ▁ch ond rit es , ▁which ▁are ▁found ▁in ▁carbon - rich ▁meteor ites ▁and ▁lun ar ▁so ils . ▁ ▁Rem ark ably ▁similar ▁l ith ost rat ig raph ic ▁and ▁chron ost rat ig raph ic ▁struct ural ▁sequences ▁between ▁these ▁two ▁cr at ons ▁have ▁been ▁noted ▁for ▁the ▁period ▁between ▁ 3 . 5 ▁and ▁ 2 . 7 ▁billion ▁years ▁ago . ▁Pale om agnet ic ▁data ▁from ▁two ▁ul tr am af ic ▁complex es ▁in ▁the ▁cr at ons ▁showed ▁that ▁at ▁ ▁the ▁two ▁cr at ons ▁could ▁have ▁been ▁part ▁of ▁the ▁same ▁super cont inent . ▁Both ▁the ▁Pil bara ▁and ▁Ka ap va al ▁cr at ons ▁show ▁ext ensional ▁fault s ▁which ▁were ▁active ▁about ▁ ▁during ▁f els ic ▁vol can ism ▁and ▁co eval ▁with ▁the ▁impact ▁layers . ▁ ▁Origin ▁of ▁life ▁ ▁The ▁Pil bara ▁and ▁Ka ap va al ▁cr at ons ▁are ▁some ▁of ▁the ▁oldest ▁rocks ▁in ▁the ▁world ▁and ▁they ▁contain ▁well - pres erved ▁Arch ae an ▁micro f oss ils . ▁ ▁A ▁series ▁of ▁international ▁dr illing ▁projects ▁has ▁revealed ▁traces ▁of ▁micro b ial ▁life ▁and ▁photos yn thesis ▁from ▁the ▁Arch ae an ▁in ▁both ▁Africa ▁and ▁Australia . ▁The ▁oldest ▁widely ▁accepted ▁evidence ▁of ▁photos yn thesis ▁by ▁early