Double unconformity on the River Trail. The upper horizontal strata are the lower Paleozoic section down to the the Cambrian Tapeats sandstone. At center left, strata dipping to the left comprise the Precambrian Grand Canyon Supergroup. To the right are the Vishnu schist and Zoroaster granite.
All images copyright © 2016 F.W. Vollmer and may not be used without permission.