A sandstone and shale cap, as thick as 50 feet in places, acts as an umbrella over limestone ridges. The umbrella leaks at places called sinkholes, from which surface water makes its way ...

A shallow sea advances and retreats several times during this period, leaving behind the layers named Kaibab Limestone, Toroweap Formation, and Hermit Shale. The Coconino Sandstone layer was ...

limestone, shale and coal. It's a great spot for experienced rock climbers, with dozens of rock climbing routes identified. Walkers passing along the sheer rock walls and climbers are encouraged ...