[SamT]

Drifting off topic here but re the Tar - yes that rings a  bell. I think there's a theory that its those tarry deposits found around that hill side that may have caused the blue bandings in Blue John. 

[Droyd]

Seems like it's the elaterite that's behind the geological SSSI designation (which is a band at the top of the quarried wall just next to the cave - looked like mud to us!), although some bones were also found in the cave. I've stuck it on UKC on the basis that it's brilliant both in terms of the climbing and how cool it is in hot weather, but happy to hand over mod status or change any FA details if I've got anything wrong: https://www.ukclimbing.com/logbook/crags/windy_knoll_cave-29963/

[Bonjoy]

Cheers. I've added the two variant starts.