Jack glacier

Jack glacier was a small glacier on the eastern side of Three Fingered Jack. Despite existing up into the 1980s with deposition of a prominent end moraine and being included in U.S.G.S. scientific publications, this glacier was never put on a U.S.G.S. map. It is now gone, disappearing sometime in the last 40 years. The glacier was at a very low elevation, extending to tree line; this means its shaded aspect with avalanche-supplied snow allowed the glacier to persist until the climate began to regionally warm in the 1980s.