In the beginning, it was all rock units, stacked on top of one another, about 1.84 billion years the oldest and about 270 million years the youngest. Then came the Colorado River around 6 million years ago, digging like a hell-bent geologist, carving the Grand Canyon and laying bare the rock walls embedded with earth’s story, curious like a jigsaw puzzle, misplaced pieces every so often but coherent as a whole. This northern view from Lipan Point is one such misplaced piece of earth’s story: the more horizontal riverbanks of this stretch of the Colorado River are the billion-year-old Dox Formation, intact only in the eastern Grand Canyon.