The Permian Basin is a basin[?] in the western part of the U.S. state of Texas, so named because it has one of the thickest deposits of rocks from the Permiangeologic period in the world.
... or Northern City Line (Great Northern & City Railway) remain open as mainline stations:
Great Missenden tube station[?]
Wendover tube station[?]
Stoke Mandeville tube ...