"310.0"^^ . . "Mudstone and sandstone with subsidiary limestone and trace coal. Stratified bedrock. Occurs onshore. Deposited during the Asturian Substage (Carboniferous Period) (310-307.5 Ma BP)."@en . "Poorly defined, but arbitrarily taken at the base of a sandstone-dominated succession (Enville Member), characterised by conglomerates and pebbly sandstones with extrabasinal clasts, commonly of Carboniferous limestone and chert."@en . "Alveley Member"@en . "Red mudstone and sandstone, fine- to medium-grained with thin 'Spirobis' limestone beds and pedogenic limestone (caliche). Sandstone mostly sublitharenite."@en . . . . . "307.5"^^ . "152 to 274m in Alveley area; 50 to 140m in south Staffordshire."@en . . "stable"@en . . "Keele Formation [Obsolete: use ALY, HA, MRD, SAL]"@en . . "ALY"@en . "Alveley Member"@en . . "Coventry Sandstone Formation [Obsolete: use ALY, ASY, MRD]"@en . . "Conformable, transitional-gradational boundary, arbitrarily taken at the base of the first major red-bed stratum, overlying the grey mudstone-dominated Dark Slade Member of the Halesowen Formation."@en . "Keele Beds [Obsolete: use RWD, ALY, KE]"@en . . .