. "Erosional base on Tertiary-Cretaceous bedrock."@en . "stable"@en . "Gravel, variably clayey and sandy. Forms the eighth terrace of the pre-diversionary ancestral River Thames."@en . "1-5 m at Furze Hill [SU 426 687], Bucklebury (White, 1902; Collins, 1994)."@en . . . . "Bucklebury Common Gravel Member"@en . "Gravel with subsidiary clay and sand. Stratified superficial deposits. Occurs onshore. Formed during the Early Pleistocene - to - Mid Pleistocene (Quaternary Period) (2.58-.126 Ma BP)."@en . . "BYGR"@en . "Terrace surface around Bucklebury."@en . "0.126"^^ . "2.58"^^ . "Plateau Gravel [Obsolete]"@en . . . "Bucklebury Common Gravel Member"@en . "Bucklebury Gravel [Obsolete: use BYGR]"@en . .