The BGS Lexicon of Named Rock Units — Result Details

Huntley Formation

Computer Code: HUN Preferred Map Code: HUN
Status Code: Full
Age range: Guadalupian Epoch (PUG) — Early Triassic Epoch (TE)
Lithological Description: Poorly-sorted matrix-supported conglomerate and very coarse-grained pebbly sandstone; there is a large proportion of locally-derived subrounded to angular clasts.
Definition of Lower Boundary: Unconformable on Carboniferous rocks.
Definition of Upper Boundary: Conformable, where sandstone or conglomerate with many locally-derived clasts give way to conglomerate or sandstone with few such clasts (Hawksmoor Formation).
Thickness: 0-15m
Geographical Limits: Needwood Basin (Staffordshire, Leicestershire, Derbyshire).
Parent Unit: Sherwood Sandstone Group (SSG)
Previous Name(s): Cheadle Breccias (-2249)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  Huntley: small sections up to 2m in railway cutting. 
Reference Section  For base: Hawksmoor Wood. 
Type Area  Huntley: small sections up to 2m in railway cutting. 
Reference(s):
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. 
Wills, L J. 1956. Concealed Coalfields. (Glasgow & London: Blackie). 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E124