"Bedrock. Occurs onshore. Formed during the Tournaisian Age - to - Visean Age (Carboniferous Period) (359.3-330.3 Ma BP)."@en . "Tournaisian And Visean Rocks (Undifferentiated)"@en . . . "stable"@en . . . "CTCVU"@en . "359.3"^^ . "Tournaisian And Visean Rocks (Undifferentiated)"@en . "330.3"^^ .