"Limestone."@en . "Limestone. Bedrock. Occurs onshore. Formed during the Duckmantian Substage (Carboniferous Period) (318-314.75 Ma BP)."@en . "Cambuslang Marble"@en . . "CGM"@en . "stable"@en . . "318.0"^^ . . . . "314.75"^^ . "Cambuslang Marble"@en . . . .