the awesome 3000 ft tall Iceberg Cirque that also shows you the layers of Glacier National Park. A small glacier used to crowd its upper end, with a wall of 75 feet high pushed out into the lake. There are some great pictures here including of the old glacier: http://libraryphoto.cr.usgs.gov/cgi-bin ... ;start=525

Layers of GNP, from old to young, there are Altyn (and Prichard), Appekunny, Grinnell, Empire, Helena (or Siyeh), Snowslip, and Shepard formations.

If you want to know about the layers of the Park: http://blogs.agu.org/mountainbeltway/20 ... onal-park/