"stable"@en . . "Gravel and sand. Stratified superficial deposits. Occurs onshore. Formed during the Quaternary Period (2.58-0 Ma BP)."@en . "Barham Sand and Gravel Member"@en . . "BHSG"@en . "Sand and gravel, with possible lenses of silt, clay or peat. [Generic description]."@en . . . . . "2.58"^^ . . "0.0"^^ . "Barham Sand and Gravel Member"@en . .