How was gaping gill formed?
Gaping Gill on Ingleborough Hill is one of the deepest potholes in the Yorkshire Dales, England. How it was formed depends on the type of cave. Limestone caves are formed through chemical weathering, where carbonic acid and organic compounds in ground water dissolve the carbonate minerals away, leaving a cave. Other types of caves, such as those in sandstone, are uually formed through mechanical weathering by wind or water.