Interim geologic map of the Fort Douglas quadrangle, Salt Lake, Davis, and Morgan Counties, Utah

The Fort Douglas quadrangle (Plate 1) is in Salt Lake, Davis, and Morgan Counties of northern Utah and covers part of Salt Lake Valley and rugged peaks and canyons of the central Wasatch Range, including the Sessions Mountains. This area straddles the Basin and Range and Middle Rocky Mountains Physiographic Provinces. Parts of the cities of North Salt Lake and Bountiful are in the northwest corner of the quadrangle. The southwest corner covers the northeast part of Utah’s capital, Salt Lake City, including parts of downtown, the Avenues Historic District neighborhood, and the University of Utah including its medical complex and research facilities. Some of these areas were the first parts of the valley settled and developed after the arrival of the Latter-Day Saints in 1847. The Wasatch Range contains steep and rugged terrain that is a critical watershed and recreation area for the population of the heavily urbanized Wasatch Front, as well as critical habitat for wildlife. Major drainages within the quadrangle are, from north to south: Mill Creek Canyon (Bountiful), North Canyon, City Creek Canyon, Dry Creek, Red Butte Canyon, and Emigration Canyon. The northeast corner of the quadrangle contains the upper reaches of Holbrook Canyon and Shingle Mill Creek, a tributary to Hardscrabble Canyon, which feeds the Weber River.