. . "Froghall Ironstone"@en . "Ironstone."@en . "Froghall Haematite [Obsolete: use FHI]"@en . "319.0"^^ . . . . "Froghall Stone [Obsolete: use FHI]"@en . "Ironstone. Stratified bedrock. Occurs onshore. Deposited during the Langsettian Substage (Carboniferous Period) (319-318 Ma BP)."@en . "c.0.55m"@en . . "FHI"@en . . "stable"@en . "318.0"^^ . . . "Froghall Ironstone"@en . .