"Blue Anchor Formation And Penarth Group (Undifferentiated)"@en . "BAPN"@en . "227.3"^^ . . "Mudstone, siltstone and silty mudstone with subsidiary limestone and sandstone. Bedrock. Occurs onshore. Formed during the Norian Age - to - Rhaetian Age (Triassic Period) (227.3-201.4 Ma BP)."@en . . "Blue Anchor Formation And Penarth Group (Undifferentiated)"@en . . "stable"@en . "Mudstone, siltstone and silty mudstone with subsidiary limestone and sandstone."@en . "201.4"^^ . . .