The central Pennines are formed from the [[Jurassic]] [[limestone]] of the Alston Tilt Block. In addition to typical [[karst]] landscape of scarps and [[limestone pavement]]s on the surface, there are many caves in the [[Yorkshire Dales]],<ref>http://www.sat.dundee.ac.uk/arb/yorkshire/</ref> including Britain's longest cave system, the [[Easegill System]], and its deepest single shaft at Gaping Ghyll. There are also caves in the [[Peak District]].<ref>http://w01-0504.web.dircon.net/pdc/caveguides.htm</ref> | The central Pennines are formed from the [[Jurassic]] [[limestone]] of the Alston Tilt Block. In addition to typical [[karst]] landscape of scarps and [[limestone pavement]]s on the surface, there are many caves in the [[Yorkshire Dales]],<ref>http://www.sat.dundee.ac.uk/arb/yorkshire/</ref> including Britain's longest cave system, the [[Easegill System]], and its deepest single shaft at Gaping Ghyll. There are also caves in the [[Peak District]].<ref>http://w01-0504.web.dircon.net/pdc/caveguides.htm</ref> |