Geology of the Durst Mountain-Huntsville area Morgan and Weber Counties, Utah

The Durst Mountain-Huntsville area is located about 35 miles northeast of Salt Lake City, Utah, and comprises nearly 110 square miles between Ogden and Weber Valleys. The formations exposed are the Precambrian Farmington Canyon complex; the Cambrian Tintic quartzite, Ophir shale, and Cambrian limestones and dolomites undifferentiated; Devonian Three Forks (?) formation; Mississippian Madison limestone and the Brazer formation; the Triassic Thaynes limestone; and the Tertiary Knight conglomerate, Norwood tuff, and Huntsville fanglomerate. Three episodes of faulting were noted within the area. The Durst thrust is related to mid-Laramide activity. An east-west episode of normal faulting occurred during the Miocene (?). North-south normal faulting occurred during the Pliocene and Pleistocene. The Herd Mountain erosion surface is the oldest erosion surface within the north-central Wasatch Mountains. It is dated as late Oligocene or Miocene age. A more recent erosion surface is the Weber Valley surface. The formation of this occurred in Pliocene or Pleistocene time. An arm of Lake Bonneville extended into both Ogden Valley and Weber Valley.