RobinGriffiths
Well-known member
There's an interesting section in David Bick's The Old Metal Mines of Mid-Wales Part 6 - A Micellany on misguided attempt at finding coal in the Silurian shales of Mid Wales. Bick states it was a combination of black shales and blind faith that drove the search. About half a dozen such ventures are documented. Even more bizarre were attempts to find coal in the late Pre Cambrian deposits on the Lleyn Penisnula near Rhoshirwaun.