Mosaic Canyon

Upstream from the Mosaic Canyon Fault, the bedrock consists of the Stirling Quartzite and the Johnnie Formation. These two sedimentary rock formations formed from marine deposits near the end of the Proterozoic (PreCambrian), more than 542 million years ago. The boundary between the Proterozoic and the Cambrian lies in the overlying Wood Canyon Formation. Cambrian rocks exposed in the upper canyon include, in ascending order, the Wood Canyon, Zabriskie, Carrara, and Bonanza King Formations (Hunt, 1975; Hildreth, 1976).