Interim Geologic Map of the Eastern Part of the Duchesne 30’x 60′ Quadrangle, Duchesne and Wasatch Counties, Utah Year 1 of 6

By: Douglas A. Sprinkel

This CD contains the geologic map at 1:50,000 scale and a 19-page booklet, both in PDF format. The map covers six 7.5-minute quadrangles in the eastern part of the Duchesne 30’x 60′ quadrangle. The quadrangle is located mostly in the western Uinta Basin, with the northwest corner located along the southwest flank of the Uinta Mountains but the area mapped is centered on Roosevelt, Utah. The map area includes surficial deposits that range from historic to lower Pleiestocene piedmont alluvium, stream alluvium, and glacial deposits. Bedrock map units include the Duchesne River and Uinta Formations. Structural features include the axis of the Uinta Basin syncline (and associated folds), the basin boundary fault zone in the northern part of the map area, and the Duchesne fault zone in the southern part of the map area. The Duchesne 30’x 60′ quadrangle also contains an array of geologic resources including minerals, phosphate, sand and gravel, and gilsonite, but energy resources are the most significant with the giant Altamont-Bluebell and Monument Butte fields located in the quadrangle.