"Silt and clay; of glacial origin. [Generic description]."@en . . . "Glacial Silts And Clays"@en . "GSTC"@en . . "2.58"^^ . . "Silty clay. Superficial deposits. Occurs onshore. Formed during the Quaternary Period (2.58-0 Ma BP)."@en . . . "0.0"^^ . "stable"@en . . "Glacial Silts And Clays"@en .