"Fen Silt"@en . "Silt."@en . . "Silt. Superficial deposits. Occurs onshore. Formed during the Quaternary Period (2.58-0 Ma BP)."@en . . "2.58"^^ . . . "0.0"^^ . "stable"@en . "FES"@en . . "Fen Silt"@en . .