▁known ▁as ▁ter rane ) ▁far ▁in land ▁and ▁brought ▁w ides p read ▁interior ▁desert ▁conditions ▁around ▁the ▁world . ▁New found land ▁was ▁re - ex posed ▁to ▁the ▁ocean ▁in ▁the ▁Tri ass ic ▁when ▁rif ting ▁began ▁to ▁form ▁new ▁ocean ic ▁cr ust ▁and ▁opened ▁the ▁Atlantic ▁Ocean . ▁ ▁Lab r ador <0x09> ▁Lab r ador ▁is ▁part ▁of ▁the ▁eastern ▁Canadian ▁Sh ield ▁and ▁intr us ive ▁ igne ous ▁or ▁met am orph ic ▁rocks ▁are ▁the ▁most ▁common , ▁with ▁sed iment ary ▁rocks ▁in ▁some ▁areas . ▁Four ▁of ▁the ▁seven ▁Canadian ▁Sh ield ▁provinces ▁make ▁up ▁Lab r ador . ▁Ar che an ▁age ▁rocks ▁and ▁east - west ▁struct ural ▁tr ends ▁mark ▁the ▁Super ior ▁Province ▁( a ▁small ▁area ▁in ▁the ▁west ▁near ▁Quebec ) ▁which ▁en comp ass es ▁the ▁Ash uan ip i ▁Complex ▁gran ul ite ▁and ▁gran od ior ite ▁intr ud ed ▁by ▁py ro x ene - rich ▁f els ic ▁plut ons . ▁The ▁N ain ▁Province ▁runs ▁along ▁the ▁n ortheast ▁coast ▁and ▁also ▁has ▁Ar che an - age ▁rocks , ▁although ▁a ▁greater ▁north ward ▁tr end . ▁The ▁only ▁exception ▁is ▁g ne iss ▁over lain ▁by ▁met ased iment ary ▁and ▁met av ol can ic ▁rocks ▁in ▁the ▁sout heast , ▁which ▁were ▁rec ry st all ized ▁and ▁met am orph osed ▁during ▁ 1 . 4 2 ▁billion ▁year ▁old ▁or ogen y .