Cave / Karst Systems - Grand Canyon National Park (U.S. National Park Service) Hidden within the Grand Canyon are an estimated 1,000 caves. Of those, 335 have been recorded. Very few have been mapped or inventoried. Most have developed in the limestone of the Redwall and Muav formations, although some are known to exist in other formations. Under the current park policy, all caves are currently closed to visitation, except for research purposes.
[{"cave_systems": "n/a", "tours_available": "n/a"}]
[{"cave_systems": "developed in the limestone of the Redwall and Muav formations, although some are known to exist in other formations", "tours_available": "no"}] [{"cave_systems": "n/a", "tours_available": "n/a"}] [{"cave_systems": "Grand Canyon", "tours_available": "no"}]