Kiva – Schist
When I have hiked in the deepest parts of the Grand Canyon like around Phantom, there are curious cliffs of a black and pink ( !! ) rock which have the look of being stirred up. They are now called Vishnu Schist but used to be called Zoroaster Plutonic Complex !@#$#! The rocks are something like 2 billion years old. I regret misspelling the word Vishnu on the address.
Here is a picture looking across the Colorado from Phantom:
by me @ Phantom Ranch on a thru backpack from the North Rim