The BGS Lexicon of Named Rock Units — Result Details

Rad Brook Mudstone Member

Computer Code: RKM Preferred Map Code: RkM
Status Code: Full
Age range: Holkerian Substage (CQ) — Holkerian Substage (CQ)
Lithological Description: A dark to pale olive-and blue-grey, calcareous, bioturbated mudstone, interbedded with dark, laminated, micromicaceous, calcareous siltstones andsporadic fine-grained, grey-blue packstones and wackestones.
Definition of Lower Boundary: The base of the first mudstone above the characteristic pale noduliferous wackestones of the Hodderense Limestone Formation.
Definition of Upper Boundary: Taken at the base of the lowest packstone of the Pendleside Limestone Formation with less than 50% interbedded mudstone.
Thickness: Up to 100 m thick.
Geographical Limits: Limited to the southern part of the Craven Basin; absent north of the Clitheroe (SD82 44) and Whitwell (SD64 47) anticlines.
Parent Unit: Pendleside Limestone Formation (PDL)
Previous Name(s): Rad Brook Beds (-4864)
Alternative Name(s): none recorded or not applicable
Type Section  Pendle Hill, stream section in Rad Brook, 2 km east of Worston: Complete section is exposed. Riley, 1990. 
Metcalfe, I, 1981. Conodont zonation and correlation of the Dinantian and early Namurian strata of the Craven Lowlands of Northern England. Institute of Geological Sciences, Report No. 80/10, p.1-70. 
Aitkenhead, N, Bridge, D M, Riley, N J and Kimbell, S F. 1992. Geology of the country around Garstang. Memoir of the British Geological Survey, Sheet 67 (England and Wales) 
Riley N J. 1990. Stratigraphy of the Worston Shale Group (Dinantian) Craven Basin, north-west England. Proceedings of the Yorkshire Geological Society, Vol. 48, 163-187. 
1:50K maps on which the lithostratigraphical unit is found, and map code used: