National Geographic : 1918 Feb
Photograph by J.W. Shipley A FUMAROLE ON THE BANK OF FISSURE LAKE "Near the foot of three glaciers occurs the most conspicuous fissure to be found anywhere in thevalley. Itis200 to400 feet wide, with per pendicular walls, one of which stands about 35 feet higher than the other. Its depth could not be ascertained because itisfilled byabeautiful lake of clear, green water. Along its sides are numerous snow-drifts from which miniature bergs break off and float away inthe clear water. Fed by glaciers, one would expect Fissure Lake to be icy cold, but, on the contrary, it is decidedly tepid inspots, where itreceives heat from below."