Geology of the upper Ogden Canyon, Weber County, Utah

Ogden Canyon is located immediately east of Ogden, Utah, and traverses the north central Wasatch Mountains to Ogden Valley. The formations exposed in the Upper Ogden Canyon are: overthrust Proterozoic beds; the Devonian Jefferson dolomite, subdivided into the Hyrum and Beirdneau members; the Mississippian Madison limestone, Deseret limestone, and Humbug formation; and the Tertiary Knight conglomerate and Norwood tuff. Unconformities are recognized between the Beirdneau member of the Jefferson and the Madison limestone, and between the Madison and the Deseret limestone. An emergent area to the northwest at the end of Madison deposition is proposed. Several north-south trending normal faults of small displacement, probably of Laramide age, cut the rocks at the head of Ogden Canyon. The west side of Ogden Valley is marked by a northwesterly trending normal fault of the Basin and Range system. Proterozoic rocks rest across the beveled edges of the Paleozoic formations on both sides of Ogden Canyon. This is the Willard thrust, and problems of its mode of emplacement and direction of movement are discussed.