. . . . "stable"@en . "Barrock Top Limestone"@en . "Limestone. Stratified bedrock. Occurs onshore. Deposited during the Arnsbergian Substage (Carboniferous Period) (327-323.75 Ma BP)."@en . . "323.75"^^ . "327.0"^^ . . . . "BTL"@en . "Barrock Top Limestone"@en . "Limestone."@en .