Near the base of Notch Peak, pink Jurassic-age granite intrudes much older thinly bedded gray argillite and white marble of the Cambrian-age Marjum Formation. Deep in the Earth’s crust 170 million years ago, high heat and fluids from the granite metamorphosed the surrounding rock, turning limestone into marble and shale into argillite.
House Range, Millard County, Utah. Photo by Mark Milligan.
Notch Peak, Millard County, Utah
Photographer: Mark Milligan; © 2014
Banded white marble and quartz augen (eyeshaped crystals) in gray argillite, Notch Peak, Millard 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.