The Sangre de Cristo Mountains were uplifted during the Cenozoic Laramide orogeny. They are bounded on the west by the Rio Grande rift and on the east by a series of reverse and thrust faults. Vertical displacement along the faults is at least , and gravity measurements suggest the uplift has been thrust eastward great distances. This faulting places Precambrian basement rock in contact with sedimentary strata along the eastern margin of the uplift except where igneous rocks have been intruded along the fault.