Introduction to glacier traces: Mount McKinley is structurally a mountain belt on the edge of the Pacific Ocean and was formed during the Nevada orogeny at the end of the Jurassic. Mount McKinley is a huge anticlinal folded granite fault block mountain with steep mountains and two peaks in the north and south. The South Peak is the highest peak in North America with an altitude of 6193 meters, and the North Peak is 5934 meters high. The mountain is covered with snow all year round, with a snowline height of 1830 meters. The southern slope receives more precipitation and develops large-scale modern glaciers, including major glaciers such as Kahiltna and Rus. Due to the influence of the warm Pacific Current, the climate in the McKinley Mountains is relatively mild, and it is green in summer. Below an altitude of 762 meters, a large area of forest has developed, mainly fir-birch forest. Green forests, snow-white peaks, and vast glaciers reflect each other in the sun. The scenery is beautiful and refreshing. Due to less precipitation, the northern slope has a snow line as high as 1,830 meters. In 1917, Mount McKinley was designated a national park. In 1980, the park was expanded to include more surrounding land as a protected area, and the name was changed to Denali National Park.