The BGS Lexicon of Named Rock Units — Result Details
Breckells Mudstone Member
| Computer Code: | BRM | Preferred Map Code: | notEntered |
|---|---|---|---|
| Status Code: | Full | ||
| Age range: | Ladinian Age (TD) — Carnian Age (TC) | ||
| Lithological Description: | Mudstone, reddish-brown, structureless, commonly brecciated, with common halite and gypsum. | ||
| Definition of Lower Boundary: | Gradational and conformable transition from the interbedded reddish brown and greenish grey mudstones of the Coat Walls Mudstone Member to the dominantly reddish-brown, structureless mudstones of the Breckells Mudstone Member. | ||
| Definition of Upper Boundary: | Not present at outcrop or in the subsurface, onshore UK. | ||
| Thickness: | 209 m seen in Blackpool district, Lancashire (Wilson and Evans, 1990). | ||
| Geographical Limits: | Preserved in the Preesall syncline area, north Fylde peninsula, Lancashire. | ||
| Parent Unit: | Sidmouth Mudstone Formation (SIM) | ||
| Previous Name(s): | Breckells Mudstone Formation [Obsolete Name and Code: Use BRM]
(-2020)
Breckells Mudstones [Obsolete Name and Code: Use BRM] (-1390) |
||
| Alternative Name(s): | Dowbridge Mudstone Formation |
||
| Stratotypes: | |||
| Partial Type Section | Coat Walls Borehole (SD34NE/30) northern Fylde peninsula, Lancashire, from 18.20 m (base of superficial deposits) to base of Member at 152.30 m depth. Wilson and Evans, 1990. | ||
| Reference(s): | |||
| Wilson, A A and Evans, W B. 1990 Geology of the country around Blackpool. Memoir of the British Geological Survey, Sheet 66. (England and Wales). | |||
| Jackson, D I, Johnson, H and Smith, N J P. 1997. Stratigraphical relationships and a revised lithostratigraphical nomenclature for the Carboniferous, Permian and Triassic rocks of the offshore East Irish Sea Basin. 11-32 in Petroleum Geology of the Irish Sea and Adjacent Areas. Meadows, N S, Trueblood, S P, Hardman, M and Cowan, G. (editors). Geological Society Special Publication, No.124. | |||
| Howard, A S, Warrington, G, Ambrose, K, and Rees, J G. 2008. A formational framework for the Mercia Mudstone Group (Triassic) of England and Wales. British Geological Survey Research Report, RR/08/04. | |||
| Wilson, A A. 1990. The Mercia Mudstone Group (Trias) of the East Irish Sea Basin. Proceedings of the Yorkshire Geological Society, Vol.48, 1-22. | |||
| Warrington, G, Audley-Charles, M G, Elliott, R E, Evans, W B, Ivimey-Cook, H C, Kent, P E, Robinson, P L, Shotton, F W and Taylor, F M. 1980. A correlation of the Triassic rocks in the British Isles. Special Report of the Geological Society of London, No.13. | |||
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
| E075 E067 | |||