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Show KAIBAB AND THOUSAND LAKE FAULTS. 33 of the Aquarius Plateau it is joined by an important fault coming from the southsouthwest. This is the Paunsagunt fault, which lies near the eastern base of that plateau. As its throw is in the opposite direction to that of the Kaibab fault, the two are apparently distinct, though they really are branches of one displacement. The displacement now continues north along the western front of the Aquarius Plateau, and presents complication with subordinate faults. Still northward it has the Awapa Plateau for its uplifted and Grass Valley for its thrown side, the minor faults gradually merging with the principal one. Near the north end of Grass Valley it rapidly passes into a sharply -flexed monoclinal, forming the northwest shoulder of Fish Lake Plateau, and the monoclinal so formed gradually expands into a broader flexure, with an increasing displacement, and becomes the great monoclinal of the Wasatch Plateau, one of the grandest flexures of the Plateau Country. This flexure forms the southeast side of San Pete Valley for about 50 miles. It has not yet been traced beyond the northern end of this valley, but from the topography it is supposed to extend far beyond it, being in full force where it has been last observed. Its total length, reckoning as one displacement the Wasatch, Grass Valley, Table Cliff, and Eastern Kaibab portions, cannot fall much short of 300 miles, and may considerably exceed that after the termini have been discovered. It presents many phases or modifications, but the dominant feature is the monoclinal form. The maximum displacement is at the Wasatch Plateau, and reaches nearly 7,000 feet. The easternmost fault {Thousand Lake fault) of this system begins upon the southern slopes of the Aquarius Plateau, trending due north. It crosses that plateau with a dislocation of 500-600 feet, and splits into two faults, which reunite upon the northern base. Crossing the lower end of Rabbit Valley, it passes along the western base of Thousand Lake Mountain, and then swings to the northeast The throw is to the west, and in passing from the foot of the Aquarius to the base of Thousand Lake Mountain the displacement rapidly increases to about 3,500 feet, and then as rapidly diminishes, again becoming zero about 20 miles northnortheast of the mountain. But it immediately recommences with a throw in the opposite direction (east), repeating the phenomenon presented by the Sevier fault a little 3 h p |
