The Carrizo Mountains primarily consist of igneous rocks that intruded Permian through Cretaceous marine strata.
Intrusive forms include laccoliths, stocks, sills, and dikes.
31 to 20 million years ago, making them distinctly younger than the late Cretaceous intrusions of the Carrizo Mountains.
Both the Carrizo Mountains and Sleeping Ute Mountain are located along the southwest extension of the Colorado Mineral Belt, a 250-mile long lineament characterized by igneous rocks associated with abundant ore deposits.
Large ore deposits have not been found in the igneous rocks of the Carrizo Mountains, although small deposits of uranium, vanadium, copper and silver have been found in the sedimentary rocks of the Morrison Formation.