The site has been listed by the Geological Conservation Review , both for the excellent mineral specimens it has provided and .
Site is the only locality in the North Pennines ore - field where witherite mineralisation can be observed in situ at the surface .
The site has been listed by the Geological Conservation Review , both for the excellent mineral specimens it has provided and because it is the only locality in the North Pennines ore - field where witherite mineralisation can be observed in situ at the surface .