. "stable"@en . . . "319.0"^^ . "Bedrock. Occurs onshore. Formed during the Westphalian Stage (Carboniferous Period) (319-307.5 Ma BP)."@en . . . "CWRU"@en . . "307.5"^^ . "Westphalian Rocks (Undifferentiated)"@en . "Westphalian Rocks (Undifferentiated)"@en .