When I was a child visiting Castleton I always imagined that Treak Cliff was where they mined treacle, so thank you for ruining my childhood with that etymological lesson
I was once tagging along with Trevor Ford who leading a geological field trip at Castleton visiting a site with Elaterite. It is a bitumen soft and pliable (like treacle sort of) brownish. He pointed out a student who was pulling at it, scratching it and tasting it (as geologists do). We neither felt strong enough to point out to her it was actually sheep dung she had picked up. Sorry to go off topic but could not resist