Bear Wallow. The area has large groves of Maple, Oak and Aspen groves. The Rim is an escarpment defining the southwestern edge of the Colorado Plateau, and along its central and most spectacular portions is characterized by high limestone and sandstone cliffs, namely the Kaibab Limestone and Coconino Sandstone. It was formed by erosion and faulting, and dramatic canyons have been cut into it, including Fossil Creek Canyon and Pine Canyon. The name Mogollon comes from Don Juan Ignacio Flores Mogollón, the Spanish Governor of New Mexico from 1712 to 1715.