Maple Canyon Rock Published June 10, 2015 at 1280 × 1280 in You’re Going to Need a Helmet – Rock Climbing at Maple Canyon ← Previous Next → The unique rock of Maple Canyon Maple Canyon has an unique conglomerate rock with cobbles. Both climber and belayer has to wear a helmet because rocks and pebbles can come off the face. The cobbles are also good at hiding some of the sport bolts.