Big Basin Redwoods State Park

A group of conservationists led by Andrew P. Hill camped at the base of Slippery Rock on May 15, 1900 and formed the Sempervirens Club to preserve the redwoods of Big Basin. Their efforts resulted in deeding 3,500 acres of primeval forest to the State on September 20, 1902 to mark the beginning of the California State Park System.

Citation from California Office of Historic Preservation