1955 – March 1964 Howard B. Stricklin: March 1964 – February 1969 Robert R. Lovegren April 1969 – July 1972 Merle E. Stitt: August 1972 – January 1980 Bruce W. Shaw (acting): January 1980 – May 1980 Richard W. Marks: May 1980 – December 1988 John C. Reed (acting): December 1988 – January 1989 John H. Davis: January 1989 – August 1991 Robert Chandler: October 1991 – October 1993 Boyd Evison (acting): January 1994 – July 1994 Robert L. Arnberger: July 1994 – October 2000 Geography The Grand Canyon, including its extensive system of tributary canyons, is valued for its combination of size, depth, and exposed layers of colorful rocks dating back to Precambrian times. The canyon itself was created by the incision of the Colorado River and its tributaries after the Colorado Plateau was uplifted, causing the Colorado River system to develop along its present path. The primary public areas of the park are the South and North Rims, and adjacent areas of the canyon itself. The rest of the park is extremely rugged and remote, although many places are accessible by pack trail and backcountry roads. The South Rim is more accessible than the North Rim and accounts for 90% of park visitation. The park headquarters are at Grand Canyon Village, not far from the South Entrance to the park, near one of the most popular viewpoints. South Rim Most visitors to the park come to the South Rim, arriving on Arizona State Route 64. The highway enters the park through the South Entrance, near Tusayan, Arizona, and heads eastward, leaving the park through the East Entrance. Interstate 40 provides access to the area from the south. From the north, U.S. Route 89 connects Utah, Colorado, and the North Rim to the South Rim. Overall, some 30 miles of the South Rim are accessible by road. Services Grand Canyon Village is the primary visitor services area in the park. It is a full-service community, including lodging, fuel, food, souvenirs, a hospital, churches, and access to trails and guided walks and talks. Lodging Several lodging facilities are available along the South Rim. Hotels and other lodging include El Tovar, Bright Angel Lodge, Kachina Lodge, Thunderbird Lodge, and Maswik Lodge, all of which are located in Grand Canyon Village, and Phantom Ranch, located on the canyon floor. There is also an RV Park named Trailer Village. All of these facilities