Fine scrins of mostly calcite but with traces of galena and limonite in the wall of a crosscut at a small opening in a section of toadstone. The face is clean of pigment as it has spalled away. The main adit is on the Great Rake, but this crosscut is driven south along the High Tor Rake, here cutting tuffs at the base of the Upper Matlock Lava
Fine T'Owd Man stone stemples carrying a huge weight of stacked deads, certainley pre-Victorian, probably 18thC, but possibly 17thC Note the pigment stains on the walls
Well you did put it in inverted commas, and it is a very loose cover-all term...
I have some of an unconformity that is visible in a cave, and also some of coral reef that is visible in the limestone that I dig out if that is what your after.