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. 
Type Section  Cutting through which track to Ashley from Maer passes, immediately outside Maer, off road to Bates' Farm. 
Reference Section  Coton Fields No.1 Borehole (Stafford) record of cored borehole, 769ft 10ins - 967ft 0ins. SJ92SW/27. 
Reference(s):
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). 
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:
E123