The Keystone Thrust is a major geological fault located in the Spring Mountains of Nevada, where older Paleozoic rocks have been thrust over younger Mesozoic rocks. It is a classic example of a low-angle thrust fault and is important for understanding the tectonic history and structural geology of the region.
Reference: Burchfiel, B. C., & Royden, L. H. (1985). “North-South Extension within the Eastern Basin and Range Province: The Keystone Thrust Fault System.” Geology, 13(5), 419-422.