The northern Appalachians are largely made up of the same rocks under Ireland.
Scotland for sure. The Catskills are basically a stack of erosional remains from a once lofty mountain range raised during one of the 3 major collision events leading to the formation of the super-continent Pangea. Scotland has an identical set of sedimentary rock layers on their side of the Atlantic. Same composition and age.
That might explain all the moonshiners. :)