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.
Vibrant orange sand contrasts with sculpted Jurassic-age Navajo Sandstone within a large wind-eroded pothole informally referred to as the Cosmic Navel and more scientifically as the Inselberg Pit. The feature is the largest known cylindrical sandstone weathering pit on Earth.
Escalante National Monument, Garfield County. Photo by Michael Vanden Berg.
Along the Green River, Dinosaur National Monument, Uintah County, Utah. Photo by Jen Miller.