Epic Hikes of the World ( PDFDrive )

where the intricacies of Kaibab limestone, Coconino sandstone and Bright Angel
shale we had seen traced on the classroom blackboard suddenly emerged into
vivid real-world focus. The canyon, so huge and limitless from above, took on
greater intimacy as we stair-stepped down into it, winding between piñon-and
juniper-dotted rocky outcroppings and losing sight of the Colorado River. Here, the
manifold colours of the canyon walls – reds, whites, greenish-greys, creams,
oranges and ochres – became charged with more tangible meaning as we came
face to face with them, a layer at a time.