The BGS Lexicon of Named Rock Units — Result Details

Moira Formation

Computer Code: MOI Preferred Map Code: MO
Status Code: Full
Age range: Guadalupian Epoch (PUG) — Anisian Age (TA)
Lithological Description: Typically a subangular conglomerate with locally-derived clasts in a red, sandy mudstone matrix. Buff sandstones interbedded with mudstones constitute a distal facies.
Definition of Lower Boundary: An irregular unconformity surface on rocks of Precambrian to Palaeozoic age.
Definition of Upper Boundary: Sharply and in places unconformably overlain by sandstones or mudstones of Permian to Triassic age.
Thickness: Highly variable, generally 0-15m but can range up to 55m.
Geographical Limits: The unit is widely distributed at the base of the Triassic or Permian of the East Midlands, extending from Measham northwards as far as the Chesterfield area.
Parent Unit: Sherwood Sandstone Group (SSG)
Previous Name(s): Moira Breccia [Obsolete Name And Code: Use MOI] (MOB)
Permian Basal Breccia (PBB)
Permian Breccias Or Marls (-1070)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Reference Section  Former opencast quarry known as Wragg's Clay Pit, now Hillside Quarry (but fully backfilled). (Brown, H T, 1889). 
Reference(s):
Brown, H T, 1889. The Permian rocks of the Leicestershire Coalfield. Quarterly Journal of the Geological Society of London, Vol.45, 1-40. 
Ambrose, K, Hough, E, Smith, N J P and Warrington, G. 2014. Lithostratigraphy of the Sherwood Sandstone Group of England, Wales and south-west Scotland. British Geological Survey Research Report, RR/14/01. 
Carney, J N, 1996. Geology of the Swadlincote and Church Gresley District. British Geological Survey Technical Report WA/96/11. 
Worssam, B C and Old, R A, 1988. Geology of the country around Coalville. Memoir of the British Geological Survey, Sheet 155 (England and Wales) 
Fox-Strangways, C, 1905. The geology of the country between Derby, Burton-on-Trent, Ashby de la Zouch and Loughborough. Memoir of the Geological Survey of Great Britain, Sheet 141 (England and Wales). 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E155 E113 E142 E141