▁and ▁anal c ime ▁( a ▁variety ▁of ▁ze ol ite ). ▁ ▁Lith ology ▁and ▁min eral ogy ▁The ▁formation ▁contains ▁py ro cl astic ▁flows , ▁la h ars , ▁ag gl omer ates , ▁t uff s ▁and ▁ash - fall ▁depos its , ▁as ▁well ▁as ▁vol can ic - rich ▁sand st ones ▁and ▁other ▁sed iments . ▁The ▁whole - rock ▁chem istry ▁of ▁the ▁vol can ics ▁is ▁relatively ▁normal , ▁r anging ▁from ▁tra chy and es ite ▁( lat ite ) ▁to ▁ph on ol ite ▁and ▁tra chy te , ▁but ▁the ▁min eral ogy ▁is ▁unusual . ▁In ▁addition ▁to ▁anal c ime ▁and ▁mel an ite , ▁common ▁min er als ▁include ▁san id ine , ▁a eg er ine - aug ite ▁and ▁ch lor ite . ▁Bla irm or ite , ▁a ▁rare ▁anal c ime - rich ▁rock - type ▁named ▁for ▁the ▁town ▁of ▁Bla irm ore , ▁Al berta , ▁is ▁known ▁only ▁from ▁the ▁C rows nest ▁Form ation ▁and ▁a ▁local ity ▁in ▁Moz amb ique . ▁ ▁Str at ig raph y ▁The ▁C rows nest ▁Form ation ▁is ▁the ▁upp erm ost ▁unit ▁of ▁the ▁Bla irm ore ▁Group . ▁Ex pos ures ▁along ▁the ▁C rows nest ▁Highway ▁( High way   3 ) ▁and ▁the ▁rail road ▁west ▁of ▁Cole man ▁are ▁the ▁type ▁local ity . ▁ ▁It ▁is ▁under lain ▁by ▁the ▁Ma ▁But te ▁Form ation ▁(