Tag Archive for: UGS
St. George basin, Washington County, Utah
Photographer: Robert F. Biek
Ruins of the Harrisburg town site, established by Mormon pioneers in 1861, consist of blocks of Early Jurassic-age Springdale Sandstone, which a mile to the north is the main ore-bearing horizon of the Silver Reef mining district. The mining district is famous among geologists for its uncommon occurrence of silver ore in sandstone. In the distance, the Pine Valley Mountains tower 7,000 feet above the surrounding red-rock country.
Wasatch Range, Salt Lake County, Utah.
Photographer: Stefan Kirby
A winter storm clears from Superior Peak (11,132 feet) in upper Little Cottonwood Canyon southeast of Salt Lake City. Beneath its thick blanket of snow, Superior Peak is made up of tilted Precambrian-age sedimentary rocks, including the Big Cottonwood Formation and overlying Mineral Fork Tillite.