. "Culham Sands with Cherts Member"@en . . "100.5"^^ . "93.9"^^ . "Culham Sands with Cherts Member"@en . "Chert and sandstone with subsidiary muddy sandstone and trace gritty sandstone and mudstone. Stratified bedrock. Occurs onshore. Deposited during the Cenomanian Age (Cretaceous Period) (100.5-93.9 Ma BP)."@en . "Sandstone with horizons of chert, overlain by chert-free, clayey, laminated sandstone with cross-bedded lenses. Thin green clay-rich horizons occur in the basal part of the member, associated with glauconitic and pebbly sandstone. Tourmaline-rich sandstones locally form the highest part of the member."@en . "stable"@en . "Unconformable contact with overlying Eocene flint-rich gravels"@en . . . "Haldon Sands [Obsolete: use UGSD, ACGR, CUSC, THSS, WLSS]"@en . "6.71m."@en . . . "Haldon Sands Formation [Obsolete: use ACGR, CUSC, UGSD, WLSS]"@en . . . . "Contact with the underlying Ashcombe Gravels Member, marked by the upward facies change from pebbly sands and gravels (Ashcombe Gravels Member) to sandstones with cherts (Cullum Sand-with-Cherts Member)."@en . . "CUSC"@en .