Flaming Gorge, Green River. Just inside the entrance which is at the right, looking downstream. Daggett County, Utah. 1871.
USGS Earth Science Photographic Archive digital file: hjk00512

A fault system runs along the northern flank of the Uinta Mountains that places down-dropped Paleozoic, Cretaceous, and younger sedimentary strata against uplifted ancient metamorphic rocks and sandstone of Precambrian age (ranging in age about 1.0 to 2.3 billion years). These ancient rocks include the Uinta Mountain Group and the older Red Creek Quartzite and form the core of the Uinta Mountains.