Colorado River Raft Tour - the vicinity below Mile 133 Rapid

~ Mile 133: View looking upstream in the vicinity below Mile 133 Rapid. The Cardenas Lava forms the gray lower slope. The gently dipping Bass Limestone overlies the Cardenas Lava (both of Precambrian age). The flat lying Cambrian Tapeats Sandstone rests on the Precambrian rocks above the Great Unconformity.