The BGS Lexicon of Named Rock Units — Result Details
Mythop Halite Member
| Computer Code: | MSA | Preferred Map Code: | notEntered |
|---|---|---|---|
| Status Code: | Full | ||
| Age range: | Anisian Age (TA) — Anisian Age (TA) | ||
| Lithological Description: | Mudstone, reddish brown, with abundant halite veins, halite-mudstone rock ("haselgebirge") and common mudstone breccias. | ||
| Definition of Lower Boundary: | Conformable, at the gradational upward transition from structureless reddish brown mudstones (Sidmouth Mudstone Formation, undifferentiated) to the halite-rich, reddish-brown mudstones of the Mythop Halite Member. | ||
| Definition of Upper Boundary: | Conformable, at the gradational upward transition from the halite-rich mudstones of the Mythop Halite Member to structureless reddish brown mudstones (Sidmouth Mudstone Formation, undifferentiated). | ||
| Thickness: | 59 m to 101 m (Wilson and Evans, 1990). | ||
| Geographical Limits: | Fylde peninsula, Lancashire, and adjacent parts of the East Irish Sea Basin (Jackson et al., 1997). | ||
| Parent Unit: | Leyland Formation (LEMU) | ||
| Previous Name(s): | Mythop Halite Formation [Obsolete Name and Code: Use MSA]
(-4205)
Mythop Salts [Obsolete Name and Code: Use MSA] (-2947) |
||
| Alternative Name(s): | none recorded or not applicable | ||
| Stratotypes: | |||
| Type Section | Mythop Borehole (SD33SE/1), Fylde peninsula, Lancashire, full sequence proved between 154.36 m and 218.21 m depth. Curated core held at the National Geosciences Records Centre, BGS Keyworth (Wilson and Evans, 1990). | ||
| Reference(s): | |||
| 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. | |||
| 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. | |||
| 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. | |||
| 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). | |||
| 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. | |||
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
| none recorded or not applicable | |||