Posted on 27 February 201327 November 2018 by EditorJacks Cave by Phil Ryder Steve Warren in Jacks Cave, Langstrothdale 05-01-13. The cave is formed entirely in the Girvanella Bed, a band of dark limestone made up of fossilised algae. Photo – Phil Ryder. ShareClick to share on Facebook (Opens in new window)Click to share on Twitter (Opens in new window)Click to share on Tumblr (Opens in new window) Here's some related tales...