The BGS Lexicon of Named Rock Units — Result Details

Maer Formation [Obsolete Name And Code: Use TPSF]

Computer Code: MER Preferred Map Code: Mer
Status Code: Index Level
Age range: Anisian Age (TA) — Anisian Age (TA)
Lithological Description: Siltstone, interbedded and interlaminated with subordinate mudstones and sandstones. Most siltstones are red-brown and most of the sandstones are grey-green. Ripple marks and pseudomorphs after halite are common.
Definition of Lower Boundary: Conformable at the base of the siltstone-dominated sequence above the Sherwood Sandstone Group in the Stafford-Eccleshall Basin.
Definition of Upper Boundary: Conformable at the base of the mudstone dominated sequence of the overlying part of the Mercia Mudstone Group.
Thickness: c.15m in the Stoke-on-Trent district, though thickens to 60m in the Coton Fields No.1 Borehole at Stafford, near the centre of the Stafford-Eccleshall Basin.
Geographical Limits: Stafford-Eccleshall Basin.
Parent Unit: Mercia Mudstone Group (MMG)
Previous Name(s): Keuper Waterstones [Obsolete Name And Code: Part Of TPSF] (KW)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Reference Section  Mill Meece Borehole (Swynnerton) record of cored borehole, 613ft 6ins - 662ft 6ins. SJ83SW/4A. 
Reference Section  Coton Fields No.1 Borehole (Stafford) record of cored borehole, 769ft 10ins - 967ft 0ins. SJ92SW/27. 
Type Section  Cutting through which track to Ashley from Maer passes, immediately outside Maer, off road to Bates' Farm. 
Reference(s):
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. 
Rees, J G and Wilson, A A. 1998. Geology of the country around Stoke-on-Trent. Memoir of the British Geological Survey, Sheet 123 (England and Wales). 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E123