Allen named it "yukness" for the Stoney language expression for "sharpened with a knife" because it does appear as a knife-edge peak when viewed from Lake O'Hara.

The northwest end on which we stood fringed the emerald water with a growth of pine.

The south east end facing us was encircled with cliffs five hundred feet in height, from whose summit, piled high with the rocks of an old moraine, three slender waterfalls leaped into the lake.

The bed of an ancient glacier behind this is occupied by a very small lake, at the base of the sharp peak of which I spoke, and which I called by the Indian equivalent, Yukness.

[3] Yukness Mountain is composed of sedimentary rock laid down during the Precambrian to Jurassic periods.