"stable"@en . "Sandstone. Stratified bedrock. Occurs onshore. Deposited during the Langsettian Substage - to - Duckmantian Substage (Carboniferous Period) (319-314.75 Ma BP)."@en . "Sandstone."@en . . "Chamber Rock"@en . "Chamber Rock"@en . "CHBR"@en . "319.0"^^ . . . . . . "314.75"^^ .