. "274.4"^^ . "CSDS"@en . "251.9"^^ . . "Castledikes Sandstone"@en . "Castledikes Sandstone"@en . . "Sandstone. Bedrock. Occurs onshore. Formed during the Guadalupian Epoch - to - Lopingian Epoch (Permian Period) (274.4-251.9 Ma BP)."@en . "stable"@en . "Sandstone."@en . .