ine ▁Super group ▁occur ▁along ▁the ▁north western ▁edge ▁of ▁the ▁Park . ▁These ▁Dal rad ian ▁and ▁Mo ine ▁success ions ▁were ▁intens ely ▁fault ed , ▁fol ded ▁and ▁met am orph osed ▁during ▁the ▁C aled onian ▁O ro gen y ▁between ▁about ▁ 4 9 0 ▁and ▁ 4 3 0 ▁million ▁years ▁ago . ▁Ge olog ists ▁recognize ▁a ▁‘ Gr amp ian ▁event ’ , ▁cent red ▁around ▁ 4 7 0 ▁million ▁years ▁ago , ▁which ▁was ▁responsible ▁for ▁the ▁initial ▁de formation ▁of ▁the ▁Dal rad ian ▁and ▁rel ates ▁to ▁the ▁collision ▁of ▁a ▁vol can ic ▁island ▁arc ▁with ▁Laurent ia ▁over ▁a ▁period ▁of ▁about ▁ 2 0 ▁million ▁years . ▁The ▁subsequent ▁collision ▁of ▁Balt ica ▁with ▁Laurent ia ▁caused ▁the ▁‘ Sc and ian ▁event ’ ▁which ▁involved ▁further ▁fol ding ▁and ▁fault ing ▁of ▁the ▁Dal rad ian ▁rock ▁sequence . ▁The ▁Great ▁Glen , ▁Er icht - La id on ▁and ▁Glen ▁T ilt ▁fault s ▁were ▁all ▁active ▁as ▁strike - s lip ▁fault s ▁at ▁this ▁time ▁and ▁may ▁have ▁played ▁a ▁part ▁in ▁allowing ▁large ▁plut ons ▁of ▁gran ite ▁to ▁rise ▁up ▁amongst ▁the ▁Dal rad ian ▁rocks ▁and ▁then ▁cool ▁in ▁situ . ▁ ▁The ▁largest ▁of ▁these ▁plut ons ▁is ▁the ▁gran ite ▁mass ▁which ▁forms ▁the ▁C air ng orm s ▁themselves ▁and ▁which ▁was ▁emp la ced ▁around ▁ 4 2 7 ▁million ▁years ▁ago . ▁It ▁is ▁thought ▁that