A skier fell near the bottom of the East Snowfields, on the summit cone of Mt. Washington. He told us that his ski contacted a hidden rock buried beneath a thin amount of snow. This caused him to fall, which sent him over the top of a large rock and he landed on a pile of more rocks. A friend of the skier notified personnel at the Mount Washington State Park, who contacted USFS Snow Rangers in Tuckerman Ravine. The skier was splinted for a pelvic injury, and then packaged for evacuation. He was hauled uphill in a rescue litter to the Auto Road. A large number of skiers assisted with the hauling operation, as well as State Park and USFS personnel.  He was transported down the Auto Road in a State Park vehicle, to an ambulance at the base.