The BGS Lexicon of Named Rock Units — Result Details

Brassington Formation

Computer Code: BTON Preferred Map Code: Br
Status Code: Full
Age range: Neogene Period (N) — Neogene Period (N)
Lithological Description: White, pink and yellow siliceous sands with brightly coloured silts and clays, lying in pockets caused by karstic dissolution of Carboniferous limestones. Divided into: Kirkham Member, Bees' Nest Member and Kenslow Member.
Definition of Lower Boundary: The lower boundary is a sharp, unconformable contact on karstified limestones which form hollows, or 'pockets', for the formation.
Definition of Upper Boundary: Generally not preserved, but where present it is an unconformity upon which rests Quaternary till (boulder clay).
Thickness: Highly variable. 1 - 45 m recorded.
Geographical Limits: Confined to scattered pockets on the Carboniferous limestone outcrop, recognised from north of Ramshorn (SK 088 463) to south of Monyash (SK 134 635) (Chisholm et al., 1988).
Parent Unit: Great Britain Superficial Deposits Supergroup (GBG)
Previous Name(s): Pocket Deposits [Obsolete Name and Code: Use BTON] (-3252)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Section  Bees' Nest Pit, about 0.7 km due east of Brassington (Boulter et al., 1971). 
Reference(s):
Walsh, P T, Boulter, M C, Ijtaba, M and Urbani, D. 1972. The preservation of the Neogene Brassington Formation of the southern Pennines and its bearing on the evolution of upland Britain. Journal of the Geological Society of London, Vol. 128, 519 - 559. 
Boulter, M C, Ford, T D, Ijtaba, M and Walsh, P T. 1971. Brassington Formation, a newly recognised Tertiary formation in the southern Pennines. Nature, London, Vol. 231, 134 - 136. 
Chisholm, J I, Charsley, T J and Aitkenhead, N. 1988. Geology of the country around Ashbourne and Cheadle. Memoir of the British Geological Survey, Sheet 124 (England and Wales). 
McMillan, A A, Hamblin, R J O, and Merritt, J W. 2011. A lithostratigraphical framework for onshore Quaternary and Neogene (Tertiary) superficial deposits of Great Britain and the Isle of Man. British Geological Survey Research Report, RR/10/03. 343pp. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E124 E111