. "Chatwall Flags"@en . "25 to 100m"@en . "CHF"@en . . . "stable"@en . "Yellowish brown flags."@en . "458.2"^^ . "Chatwall Flags"@en . "Bedrock. Occurs onshore. Formed during the Caradoc Series (Ordovician Period) (458.2-449.75 Ma BP)."@en . . . . "449.75"^^ . .