Debris field of Madison Slide area. A 7.7 magnitude earthquake at 11:37 PM, August 17, 1959 caused the side of the mountain to detach and drop into the Madison River Valley killing campers on the valley floor and blocking the outflow of the Madison River.
Earthquake Lake formed from the Madison River when the Madison Slide blocked the outflow. Snags are trees that were in the valley prior to the outflow blockage.
Dolomite boulder that broke loose from the other side of the valley with other metamorphic rock and rode the crest of the landslide to this side of the valley.
Memorial Plaque on dolomite boulder for the 29 campers and other valley residents who died in the landslide.
Detail of dolomite rock which along with gneiss, schist and amphibolite are the main metamorphic rocks found in the land slide debris.
Gneiss in landslide debris.
Amphibolite.
Schist in landslide debris.
