Mary Ellen Gulch, American Fork Canyon, Utah County, Utah
Photographer: Tyler Knudsen; © 2013
Quartzite of the 900 million-year-old Big Cottonwood Formation holds up the rugged headwall of Mary Ellen Gulch. Well-preserved ripple marks and mud cracks indicate the Big Cottonwood Formation was deposited in the tidal zone of a shallow sea.
Pittsburg Lake, Utah County, Utah
Photographer: Sonja Heuscher
Pittsburg Lake, a glacial tarn formed in a cirque carved into the Cambrian-age Tintic Quartzite in upper American Fork Canyon, Utah County.
The Utah Geological Survey (UGS) is a division of the Utah Department of Natural Resources. Several specialized programs comprise the UGS: Data Management, Energy & Minerals, Geologic Hazards, Geologic Information & Outreach, Geologic Mapping, Groundwater & Wetlands, and Paleontology.