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