The BGS Lexicon of Named Rock Units — Result Details

Denstone Formation [Obsolete Name And Code: Use TPSF]

Computer Code: DST Preferred Map Code: DST
Status Code: Index Level
Age range: Anisian Age (TA) — Anisian Age (TA)
Lithological Description: Red-brown siltstones, thinly interlayered with very fine- to fine-grained sandstones and mudstones. Ripple marks, halite pseudomorphs, micaceous surfaces common.
Definition of Lower Boundary: Where a dominantly arenaceous sequence passes up into a dominantly argillaceous sequence (locally conformable on the Hawksmoor Formation).
Definition of Upper Boundary: Transitional, where mudstone assumes equal importance with siltstone, and sandstone becomes rare or absent.
Thickness: 0 - >50m; maximum known 57m.
Geographical Limits: Needwood Basin.
Parent Unit: Mercia Mudstone Group (MMG)
Previous Name(s): Waterstones (-4008)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Reference Section  Stream, west of Upper Tean. 
Reference Section  Stream and tributary in Broadgatehall, Drumble, 2km west-south-west of Hollington. 
Type Section  Windyharbour Borehole (between 51.57 and 103.16m) near Denstone: SK04SE/16. 
Reference(s):
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. 
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. 
Charsley, T J, 1982. A standard nomenclature for the Trassic formations of the Ashbourne district. Report of the Institute of Geological Sciences, No. 81/14. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E123 E124