2-mile out-and-back hike into the canyon narrows, with walls of water-polished marble and blue-gray conglomerate rock. The best examples of polished marble occur in the first quarter mile into the hike. At about a half mile, the canyon opens up to an expansive gravel wash, marking the top of the lower canyon, and the place where many people turn around, making it a very rewarding, short 1-mile hike.