Friars Hole Cave System is a cave in West Virginia's Greenbrier and Pocahontas counties.[2] First surveyed in the 1960s,[3] it is one of the longest in the United States and the world.
Various sources put its total length at 63 km,[4] 73.4 km,[2] 72 km,[5] to 77.4 km long.[6] The West Virginia Encyclopedia says that 44 miles of the cave have been surveyed, making it the longest cave in the state, the 7th-longest cave in the United States, and the 35th-longest cave in the world.[7] In 2017, William B. White called it is the 31st-longest cave in the world.[8]
The cave has ten entrances, five of which are closed:[9] Friars Hole, Rubber Chicken, Crookshank Pit, Toothpick, Snedegars caves entrances (Snedegars Staircase, Snedegars Saltpeter, Snedegars Stream, Snedegars North), and Canadian Hole, Radio Pit.[7][10][4]
The cave formed in the MississippianGreenbrier Group. The oldest passage to the cave is said to 4.1 million years old.[11] The cave was formed by streams sinking down into the ground.[12] The minor structures in the cave were influenced by thrust faults.[13]
^Gulden, Bob (2022-11-15). "USA Longest Caves". Archived from the original on April 21, 2006. Retrieved 3 July 2023.
^ abMedville, Douglas M.; Worthington, Stephen R.H. (2018), White, William B. (ed.), "The Friars Hole System", Caves and Karst of the Greenbrier Valley in West Virginia, Cave and Karst Systems of the World, Cham: Springer International Publishing, pp. 135–152, doi:10.1007/978-3-319-65801-8_8, ISBN978-3-319-65801-8, retrieved 2021-09-25