. . . . "Farrington Formation [Obsolete: use FRF]"@en . . . . . . . . "Mudstone with subsidiary coal, sandstone and seat-earth mudstone. Stratified bedrock. Occurs onshore. Deposited during the Asturian Substage (Carboniferous Period) (310-307.5 Ma BP)."@en . . "Top of the uppermost coal seam of the Farrington Member, overlain conformably by red and grey measures of the \"Barren Red Member\"."@en . . . "stable"@en . . "Farrington Member"@en . . . . "Up to 425m in the Radstock part of the Somerset Coalfield."@en . . . . . "Farrington Member"@en . . "Farrington Group [Obsolete: use FRF]"@en . . . . "310.0"^^ . . "307.5"^^ . . "Base of Member taken at the top of the Rudge Vein Coal in the Somerset Coalfield; top of the High Vein Coal in the Bristol Coalfield; top of the Avonmouth No. 2 Coal in the Severn Coalfield. Underlain by sandstones of the Mangotsfield Member and overlain by grey mudstone of the Farrington Member."@en . . "Grey mudstone with subordinate sandstone (lithic arenite) beds and numerous thin coal seams associated with comparatively thick seatearth clays."@en . . "FRF"@en . . . . .