Exploring the Earth and Sky of the West

Glacier National Park, Montana

Cliffs of dark gray limestone belonging to the Helena Formation tower above Upper Grinnell Lake.
A bighorn sheep (Ovis canadensis) alongside the trail, with Grinnell Glacier in the background.
A thunderstorm approaches over the Garden Wall on the descent from Grinnell Glacier.
Panoramic view of Grinnell Glacier (left) and Upper Grinnell Lake.
Sunrise light on Mt. Grinnell, reflected in the tranquil waters of Swiftcurrent Lake, Glacier National Park, Montana.
Hiking through the redbeds of the Grinnell Formation on the way to Grinnell Glacier.