Английская Википедия:Friars Hole Cave System
Шаблон:Short description Шаблон:Infobox cave Friars Hole Cave System is a cave in West Virginia's Greenbrier and Pocahontas counties.[1] First surveyed in the 1960s,[2] it is one of the longest in the United States and the world.
Various sources put its total length at 63 km,[3] 73.4 km,[1] 72 km,[4] to 77.4 km long.[5] 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.[6] In 2017, William B. White called it is the 31st-longest cave in the world.[7]
The cave has ten entrances, five of which are closed:[8] Friars Hole, Rubber Chicken, Crookshank Pit, Toothpick, Snedegars caves entrances (Snedegars Staircase, Snedegars Saltpeter, Snedegars Stream, Snedegars North), and Canadian Hole, Radio Pit.[6][9][3]
The cave formed in the Mississippian Greenbrier Group. The oldest passage to the cave is said to 4.1 million years old.[10] The cave was formed by streams sinking down into the ground.[11] The minor structures in the cave were influenced by thrust faults.[12]
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