"The Alaska Range is a 600-mile long arc of mountains that stretches from the Alaska-Canada border all the way to the Alaska Peninsula. The range is highest at its mid-section, a vast region of towering peaks and massive glaciers that lies within Denali National Park and Preserve. Denali is a region of great geologic activity and complexity, and scientists are only beginning to piece together its puzzling past. It has rock formations that have been carried there from thousands of miles away, fossils of ancient creatures that have been plowed up from ocean depths, new rocks born of the Earth’s internal fire, and some of the oldest rocks in Alaska."