Geologic Activity

An aerial view of the Windfall Mountain Fire in winter

NPS Photo by Ed Christensen


With millions of layers of geology exposed above the surface and two fault lines intersecting in the preserve, Yukon-Charley Rivers is rich with geologic activity. Learn more through the links below.

Windfall Mountain Fire Panorama

Windfall Mountain Fire

A puzzling geologic event that began as an explosion in the fall of 2012.

Calico Bluff
600 million years of geologic history. Dig in.

Last updated: April 14, 2015

Contact the Park

Mailing Address:

P.O. Box 167
Eagle, AK 99738


(907) 547-2233

Contact Us