. . "0.0"^^ . "Calcareous tufa is a type of tufa."@en . . "stable"@en . "Calcareous tufa"@en . . . "Trace calcareous tufa. Superficial deposits. Occurs onshore. Formed during the Quaternary Period (2.58-0 Ma BP)."@en . "CAT"@en . "Calcareous tufa"@en . . . "2.58"^^ . .