"In Pembrokeshire, the lower boundary is placed at the sharp junction where the basal sandstone of the formation (and of the Conigar Pit Sandstone Member) rests conformably on the top of the topmost calcrete of the Chapel Point Limestone Member. \r\n\r\nIn the Welsh Borderland, the base of the formation in the M50 section rests on a particularly thick (about 15 m) calcrete (the Chapel Point Limestone Member), above which fluvial sandstones appear in large quantity in the succession."@en . . "Abdon Group [Obsolete: use FWW]"@en . . "Ditton Subgroup [Obsolete: use FWW]"@en . . . "Sandstone with subsidiary conglomerate, mudstone and siltstone. Stratified bedrock. Occurs onshore. Deposited during the Lochkovian Age (Devonian Period) (419-412.4 Ma BP)."@en . "stable"@en . . . "419.0"^^ . . . . "St Maughans Formation [Obsolete: use FWW]"@en . "412.4"^^ . . . . "Red Marl Group [Obsolete: use FWW]"@en . . "Freshwater West Formation"@en . . "410.5"^^ . . "Sandstone and Marl Group [Obsolete; use FWW]"@en . . "Very fine- to medium-grained sandstones with subordinate calcrete-bearing mudstones and intraformational conglomerates (Conigar Pit Sandstone Member) and thick, red mudstones–siltstones that are commonly blue-mottled, laminated, and calcretised (Rat Island Mudstone Member); at Gelliswick Bay it consists of fining-upwards alluvial cycles of sandstone–siltstone–red mudstone. The sandstones are dark red to brown and intraformational conglomerate lenses occur locally at the bases of cycles. In the Welsh Borderland the formation comprises interbedded red mudstones (about 60 to 70 per cent) and red-brown, purple and green sandstones, commonly arranged in fining-upwards fluvial cycles, subsidiary intraformational conglomerates, common calcrete glaebules in the mudstones; mature calcretes are sporadically preserved, the Lower and Upper Abdon Limestones being more widespread."@en . "Upper Marl Group [Obsolete; use FWW]"@en . . "The formation is 305 to 580 m thick south of the Ritec Fault and 1000 to 1500 m thick to the north of the fault in Gelliswick Bay. In the Welsh Borderland, about 630 m of beds are present in the M50 section assuming that no strata are cut out or repeated by faulting in the intervals that were unexposed when the motorway was made (Allen and Dineley, 1976)."@en . "Stratified bedrock. Occurs onshore. Deposited during the Lochkovian Age - to - Pragian Age (Devonian Period) (419-410.5 Ma BP)."@en . . "Gelliswick Bay Formation [Obsolete: use FWW]"@en . "FWW"@en . . "In Pembrokeshire, the upper boundary, previously interpreted as a disconformity or unconformity at the type locality, is now re-interpreted as a conformable boundary (Hillier and Williams, 2007). It is placed where the topmost red-brown mudstones of the formation (and of the Rat Island Mudstone Member) are overlain by interbedded intraformational conglomerates and bright red mudstones of the Ridgeway Conglomerate Formation, the junction being placed at the first appearance of conglomerate. \r\n\r\nNorth of the Ritec Fault, the upper boundary is a conformable junction where green sandstones and mudstones of the Llanstadwell Formation of the Cosheston Subgroup succeed red mudstones and sandstones of the Freshwater West Formation. In continuous exposure, the top is placed 'at the base of lowest mudstone with a recognisably grey-green colouration' (Allen and Williams, 1978). \r\n\r\nIn the Welsh Borderland, the top is transitional, and placed at the top of the highest substantial calcrete, which may correlate with a similar horizon in the Black Mountains and the Clee Hills. The upper boundary is placed at the base of the Brownstones Formation and (locally) Senni Formation, where sandstone-dominated sequences begin. Locally, the top of the formation is placed at the top of the higher of two well-developed calcretes. These are the Abdon Limestones in the Clee Hills."@en . "Freshwater West Formation"@en . . .