Geologic Map of The Donkey Flat Quadrangle, Uintah County, Utah
By: Paul H. Jensen, Douglas A. Sprinkel, Bart J. Kowallis, and Kent D. Brown
The Donkey Flat quadrangle is less than 10 miles north-northeast of Vernal, Utah, along the south flank of the Uinta Mountains in Uintah County. It includes Red Fleet State Park and is crossed by U.S. Highway 191 (a National Scenic Byway). The geology is well exposed and uncomplicated, making a dramatic landscape with thick sandstone cliffs and varicolored to drab gray slopes. The quadrangle’s namesake, Donkey Flat, is a one of several geomorphic surfaces mantled by piedmont gravel deposits.