The BGS Lexicon of Named Rock Units — Result Details
Farrington Member
| Computer Code: | FRF | Preferred Map Code: | notEntered |
|---|---|---|---|
| Status Code: | Full | ||
| Age range: | Asturian Substage (CAS) — Asturian Substage (CAS) | ||
| Lithological Description: | Grey mudstone with subordinate sandstone (lithic arenite) beds and numerous thin coal seams associated with comparatively thick seatearth clays. | ||
| Definition of Lower Boundary: | 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. | ||
| Definition of Upper Boundary: | Top of the uppermost coal seam of the Farrington Member, overlain conformably by red and grey measures of the "Barren Red Member". | ||
| Thickness: | Up to 425m in the Radstock part of the Somerset Coalfield. | ||
| Geographical Limits: | Bristol, Somerset and Severn coalfields. | ||
| Parent Unit: | Grovesend Formation (GDB) | ||
| Previous Name(s): | Farrington Group
(-914)
Farrington Formation [Obsolete Name and Code: Use FRF] (-2806) |
||
| Alternative Name(s): | none recorded or not applicable | ||
| Stratotypes: | |||
| Type Area | Farrington Gurney (ST 63 55), Somerset Coalfield. (Kellaway and Welch, 1993) | ||
| Reference Section | Old Mills Colliery, underground borehole (ST65NE15) (ST 6516 5516): Basal part of member from top of the Rudge Vein Coal at 261.9 m Below OD to 250.5 m Below OD. (Kellaway and Welch, 1993) | ||
| Reference(s): | |||
| Waters, C N, Barclay, W J, Davies, J R and Waters, R A. In press. Stratigraphical framework for Carboniferous successions of Southern Great Britain (Onshore). British Geological Survey Research Report, RR/05/06. | |||
| Kellaway, G A and Welch, F B A. 1993. Geology of the Bristol district. Memoir of the British Geological Survey Special Sheet [England and Wales]. | |||
| Waters, C N, Waters, R A, Barclay, W J, and Davies, J R. 2009. Lithostratigraphical framework for Carboniferous successions of Southern Great Britain (Onshore). British Geological Survey Research Report, RR/09/01. 184pp. | |||
| Kellaway, G A. 1969. The Upper Coal Measures of South-West England compared with those of South Wales and the Southern Midlands. Compe Rendu 6e Congres Internationale Stratigraphie et Geologie Carbonifere, Sheffield, 1967, Vol. 3, 1039-1055. | |||
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
| E281 E251 E264 E265 E280 | |||