“ Among the larger mammals, the mule deer are especially numerous and can frequently be observed along the floor of Zion Canyon in late evening. A few bighorn are present but spend their time in the relatively inaccessible canyons, hence are seldom seen. Other mammals, such as the mountain lion, bobcat, coyote, and fox, are resident within the park, but are rarely encountered because of their timidity. Ground squirrels and chipmunks are numerous and frequently tame. It is wisest to enjoy them without actual contact, however, for some rodents have been known to carry dangerous diseases. ”

“ In the development of the amazing variety of architectural features on the canyon walls, the composition and structure of the Navajo formation have served as controlling guides. In addition to the bedding planes—horizontal, oblique, and curved surfaces—the Navajo has developed parting planes (joints) that extend downward for short distances or pass through the formation from top to bottom. These bedding planes and joints determine the shape and size of the blocks that spall off from the towering cliff walls. ”

“ Approximately 26 miles of trails lead to the more important sections of the park which are not reached by roads. These trails are well maintained and can be used at all seasons of the year, with the exception of those to the rims of the canyon which are closed by snow during the winter months.
The most popular of the footpaths, which have been constructed at different levels in the canyon, is the one extending a mile up the canyon from the end of the road at the Temple of Sinawava to the beginning of the Narrows. ”