Banff

Castle Mountain in Banff National Park, Canada.
Just over 9,000 ft, asl. It lies mid way between Banff and Lake Louise.
A terrific hike leads to Rock Bound Lake which sits near the top. Next time
I go I will hike it, just couldn't find the time while there.
The mountain is made up of shale interspersed by harder layers of quartzite, dolomite and limestone.