"stable"@en . . . . . . "Sand with subsidiary silt and trace shelly sand. Superficial deposits. Occurs onshore. Formed during the Anglian Stage (Quaternary Period) (.48-.423 Ma BP)."@en . "BRDC"@en . "0.48"^^ . "Bridlington Crag"@en . "Silty sand, green-grey, rarely shelly. [Generic description: academic papers and BGS Memoirs]."@en . "0.423"^^ . . "Bridlington Crag"@en .