The BGS Lexicon of Named Rock Units — Result Details

Farrington Member
Computer Code: FRF Preferred Map Code: notEntered
Status Code: Full
Age range: Westphalian D Sub-age (CD) — Westphalian D Sub-age (CD)
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 Formation (-2806)
Farrington Group (-914)
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]. 
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
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