A stack of Cambrian-age Tapeats Sandstone on Precambrian Vishnu Schist at Monument Canyon in Arizona’s Grand Canyon. Separating the Tapeats Sandstone (~ 525 MA) from the Vishnu Schist (~ 1,700 MA) lies The Great Unconformity reflecting ~ 1.2 billion years of missing rock record. Accessed via the Tonto trail, Monument Canyon is about 10 miles west of Indian Garden and the Bright Angel trail. (Photo by Nyal Niemuth)
Photographer: Nyal Niemuth
Photo Date: April 2013