Pictures from several days of course marking the Hardrock 100 Mile Endurance Run in the Rocky Mountains, Colorado.
The photos show sections of Green Mountain/Buffalo Boy Ridge, Handies Peak, Oh! Point to Ouray, the climb to Virginius Pass, Grant-Swamp Pass and Island Lake.
Hardrock is held every year in July, starting from the town of Silverton. The average elevation of the course is 11,000 feet, and runners ascent and descent some 66,000 feet in total. The maximum time allowed to complete the race is 48 hours.
The race is only officially done when a finisher kisses the Hardrock, a rock with the picture of a mountain ram.