The BGS Lexicon of Named Rock Units — Result Details

Radstock Member

Computer Code: RAD Preferred Map Code: notEntered
Status Code: Full
Age range: Asturian Substage (CAS) — Asturian Substage (CAS)
Lithological Description: Grey mudstone and numerous thin, muddy coal seams.
Definition of Lower Boundary: In the Radstock Basin the base of the member is taken at the base of the Nine Inch Seam. In the Pensford Basin the base is taken at the base of the Number Eight Seam (Kellaway, 1993). Underlain by red and grey mottled mudstone of the Barren Red Member.
Definition of Upper Boundary: In the Radstock Basin the top of the member is taken at the top of the Withy Mills Seam. In the Pensford Basin the top occurs at the top of the Forty Yard Seam (Kellaway, 1993). Overlain by grey mudstone and siltstone of the Publow Member.
Thickness: Up to 315m in the Pensford Basin; 250m in the Radstock Basin.
Geographical Limits: Restricted to the Somerset Coalfield (ST66)
Parent Unit: Grovesend Formation (GDB)
Previous Name(s): Radstock Formation (-1782)
Radstock Group (-478)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Reference Section  Hursley Hill Borehole (ST66NW2) (ST 6180 6565): from base of member at 585.4 m to top of member at 306.6 m. (Kellaway and Welch, 1993). 
Type Area  Radstock, Somerset (ST 68 55). (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. 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. 
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]. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E281 E280