Guadalupe Mountains National Park safeguards the world's finest example of a fossilized reef, a surprisingly complex and unique assemblage of flora and fauna, and West Texas' only legally designated wilderness. Rising from the desert, this mountain mass contains portions of the world's most extensive and significant Permian limestone fossil reef. Also featured are a tremendous earth fault, lofty peaks, unusual flora and fauna, and a colorful record of the past. Leashed pets are allowed on the Pinery Trail, the trail between the campground and visitors' center, and in developed areas, such as picnic areas, parking lots, and along gravel and paved roads. Leashes must be no longer than six feet. Pets are not allowed in the buildings or on trails.