The Vishnu Basement Rocks form a low point at this site, and the border between those rocks and the Tonto group is called the Great Unconformity.
The Vishnu Basement Rocks form a low point at this site, and the border between those rocks and the Tonto group is called the Great Unconformity. A cantilevered bridge over one site at the west end of this location is managed by the Hualapai Tribe and is known as the Skywalk. This location also houses most of the Kaibab ("KYE- bob") Plateau to the north, from which the Bright Angel Point Trail is accessible. Bright Angel Lodge, however, is located on the south rim of this site's namesake feature. For 10 points, name this US National Park, where the Colorado River formed a large ravine through layers of Arizona sandstone.
The Vishnu Basement Rocks form a low point at this site, and the border between those rocks and the Tonto group is called the Great Unconformity.
Grand Canyon National Park 