Flipping through field notebooks…
Recent interpretation of reflection seismic lines along the southwestern margin of the uplift late Paleozoic Uncompahgre uplift as well as west of the uplift in the Paradox and southern Uinta basins reveals structures consistent with Pennsylvanian and Permian oblique sinistral-reverse slip on the Uncompahgre fault. Measured offset of the reverse component varies from 13,000 to 20,000 ft (4,000--6,000 m) vertically and 1--6 mi (2--10 km) horizontally either on a single fault or distributed over several faults. No direct measurement of lateral offset has yet been made, but structures west of the uplift in the southern Uinta Basin indicate a left-lateral displacement of 6 mi (10 km) or less. Late Paleozoic structures in both the Paradox and southern Uinta basins are characterized by high-angle reverse and normal faults in a block-faulting pattern similar to that observed in the Piceance and San Juan basins. The principal Paleozoic faults in the southern Uinta basin are northwest-striking, northeast-directed reverse faults that have as much as 5,000 ft (1,525 m) of throw. A belt of north-south striking, west-directed thrust faults east of Price, Utah, probably formed in response to the strike-slip component of movement of the Uncompahgre block. Northwest-striking, high-angle reverse faults in the latemore » Paleozoic Paradox basin suggest a major northeast-southwest-directed compressional component in the formation of the basin and its large salt-cored anticlines. Analyses of movement histories on a number of faults in the southeastern Paradox basin indicate that although the Desmoinesian to Wolfcampain was the most significant period of tectonism, there were many other episodes of lesser but still measurable activity.« less
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