▁four ▁major ▁events . ▁The ▁Q ab ri ▁Bah ar ▁complex ▁formed ▁ ▁in ▁the ▁Pale opro ter oz o ic ▁through ▁the ▁Mes opro ter oz o ic ▁with ▁ma fic ▁and ▁gran ito id ▁rocks , ▁as ▁well ▁as ▁rocks ▁met am orph osed ▁up ▁to ▁gran ul ite ▁grade ▁in ▁the ▁sequence ▁of ▁met am orph ic ▁fa cies . ▁Some ▁ge olog ists ▁propose ▁that ▁the ▁Q ab ri ▁Bah ar ▁complex ▁may ▁preserve ▁rocks ▁from ▁before ▁the ▁Pan - A fr ican ▁or ogen y . ▁Major ▁Event ▁II , ▁more ▁than ▁ 7 0 0 ▁million ▁years ▁ago , ▁marked ▁de formation , ▁partial ▁mel ting ▁( also ▁known ▁as ▁an ata xis ▁and ▁rocks ▁met am orph osed ▁up ▁to ▁am ph ib ol ite ▁grade . ▁▁ ▁Major ▁Event ▁III ▁happened ▁ 7 0 0 ▁to ▁ 6 4 0 ▁million ▁years ▁ago , ▁bringing ▁cr ust al ▁thin ning ▁and ▁extension , ▁ma fic ▁vol can ism ▁in ▁the ▁Abd ulk ad ir ▁complex ▁and ▁M ait ▁complex , ▁regional ▁he ating , ▁met am orphism ▁and ▁the ▁emp lacement ▁of ▁gab bro ▁and ▁sy en ite ▁through ▁the ▁th inned ▁cr ust . ▁Major ▁Event ▁IV ▁continued ▁for ▁ 1 0 0 ▁million ▁years , ▁from ▁ 6 0 0 ▁to ▁ 5 0 0 ▁million ▁years ▁ago , ▁sp anning ▁into ▁the ▁Pale oz o ic ▁Era ▁of ▁the ▁Ph an ero zo ic ▁E on . ▁Gran ites ▁were ▁emp la