A complex system of faults forms the boundary between the Uinta Uplift on the south and the several adjacent basins and uplifts which lie to the north and northeast [Fig. 1 ). Four major faults and innumerable associated Faults of lesser magnitude make up this 200 mile-long s).stem. Along the entire mountain flank these faults are high angle reverse or low angle overthrust faults which carry the Uinta Uplift upward and outward, elevating it and causing it to override the margin 01 the adjacent and subjacent basins and lesser uplifts.