"Crayford Silt Member"@en . . "Obsolete name. Clay and silt. Stratified superficial deposits. Occurs onshore. Formed during the Quaternary Period (2.58-0 Ma BP)."@en . "Crayford Silt Formation [Obsolete: use CFSI]"@en . "2.58"^^ . . . . . "0.0"^^ . "[Obsolete: use CFSI]"@en . . . "Crayford Silt Formation [Obsolete: use CFSI]"@en . "archaic"@en . . "CRAY"@en .