wie auch Rheinisches S.

So you better give the original german name with an additional information (your porposed translation) in breckets. How's that?

that sounds good. thank you. it's probably the best solution.

Als Erläuterung zu Thuringian Schiefergebirge schlage ich Shale Mountains vor. Slate ist bearbeiteter Schiefer, z.B. Dachschiefer.