Dan McCaslin: Potrero John Trail and Canyon Perfect for Half-Day Hike

Dan McCaslin: Potrero John Trail and Canyon Perfect for Half-Day Hike

Back in the day, I would avidly read about box canyons and “slot canyons” in western stories by Zane Grey, Louis L’Amour and Elmore Leonard, and these niche wilderness zones play well as scenes for tough going and exciting adventures. The world’s greatest nature writer, Robert Macfarlane, quotes “Home Ground,” noting: “That rivers and streams seldom flow naturally in straight lines [which] is a gift of beauty; otherwise we would not have canyons…