"Llynfi Member"@en . . . . "The base is placed at the base of the lowermost thick (over about 3 m) bed of lithic arenite ('Pennant sandstone'), overlying the mudstone-dominated succession of the South Wales Coal Measures Group. The base lies immediately above the Cambriense (Upper Cwmgorse) Marine Band in south-west of the South Wales Coalfield basin. Northeastwards, the Pennant sandstone facies commences at a progessively higher level."@en . "LLFB"@en . . "Llynfi Beds [Obsolete: use SWUCM, LLFB]"@en . "The top is taken at the base of the No.2 Rhondda Coal (Woodland et al., 1957), overlain by lithic arenite and thin mudstones and siltstones which make up most of the Rhondda Member. The base of the coal rests on a mainly thin development of seatearth and mudstone at the top of the member, which overlie thick lithic arenites."@en . . "314.75"^^ . . . . . . . . . . "Lithic-arenite with subsidiary mudstone, seat-earth mudstone and siltstone and trace coal and seat-earth sandstone. Stratified bedrock. Occurs onshore. Deposited during the Bolsovian Substage (Carboniferous Period) (314.75-310 Ma BP)."@en . . . . . "stable"@en . . "Green-grey and blue-grey, feldspathic, micaceous lithic arenites ('Pennant sandstones') with thin mudstone/siltstone and seatearth interbeds and mainly thin coals. \r\n\r\nBolsovian."@en . "Up to 420 m in the Swansea district."@en . "310.0"^^ . . . . "Llynfi Formation [Obsolete: use LLFB]"@en . . . "Llynfi Member"@en . . . . . .