▁A ▁major ▁an orth os ite - ad am ellite ▁plut on ▁intr udes ▁the ▁province . ▁South ▁of ▁the ▁Davis ▁In let , ▁the ▁Hop ed ale ▁G ne iss ▁is ▁the ▁defining ▁rock ▁unit . ▁ ▁N ain ▁Ar che an ▁g ne iss ▁is ▁over lain ▁to ▁the ▁north ▁of ▁the ▁community ▁of ▁N ain , ▁New found land ▁and ▁Lab r ador ▁by ▁the ▁und e formed ▁Ram ah ▁Group ▁sh ale , ▁sand stone ▁and ▁quart z ite ▁from ▁the ▁Ap he bian . ▁The ▁M ug ford ▁Group ▁th ole i ite ▁bas al ts ▁and ▁py ro cl astic ▁flows ▁over lie ▁similar ▁sed iment ary ▁rocks . ▁The ▁vol can ic ▁rocks ▁are ▁between ▁ 1 . 4 9 ▁and ▁ 2 . 3 ▁billion ▁years ▁old . ▁The ▁N ain ▁Province ▁is ▁sub div ided ▁into ▁the ▁Mak kov ik - sub prov ince , ▁which ▁is ▁mainly ▁made ▁up ▁of ▁the ▁ 2 5 , 0 0 0 ▁foot ▁thick ▁A ill ik ▁Group ▁quart z of eld sp ath ic , ▁arg ill ite , ▁lim estone , ▁con gl omer ate , ▁par agne iss ▁and ▁iron ▁form ations . ▁ ▁The ▁Church ill ▁Province ▁is ▁situated ▁in land ▁in ▁north - central ▁Lab r ador ▁and ▁was ▁de formed ▁during ▁the ▁Hudson ian ▁or ogen y . ▁An orth os ite ▁intr us ions ▁partly ▁obsc ure ▁it ▁in ▁places , ▁but ▁a ▁my lon ite ▁zone ▁marks ▁it ▁northern