The BGS Lexicon of Named Rock Units — Result Details

Mohuns Park Mudstone Bed

Computer Code: MPMU Preferred Map Code: MPM
Status Code: Full
Age range: Callovian Age (JC) — Callovian Age (JC)
Lithological Description: Silicate mudstone, medium grey, weakly calcareous, slightly pyritous, shelly, with sporadic beds of argillaceous limestone nodules.
Definition of Lower Boundary: Arbitary boundary drawn at the top of highest substantial sandstone or sandy mudstone of underlying Kellaways Formation, above which the succession is predominantly mudstone.
Definition of Upper Boundary: Arbitary boundary within upward transition from grey mudstone to predominantly brownish grey, generally more fissile and organic-rich ("bituminous") mudstone of overlying Peterborough Member.
Thickness: 0 - 19m
Geographical Limits: Trudoxhill (Somerset) to Holwell (Dorset).
Parent Unit: Peterborough Member (PET)
Previous Name(s): Mohuns Park Member (-406)
Alternative Name(s): Peterborough Member
Stratotypes:
Reference Section  BGS Combe Throop Borehole (ST72SW/1), 2km eastnortheast of Abbas Combe, near Wincanton, Dorset. 29.6 to 48.7m depth. Bristow et al., 1995. 
Type Area  Mohuns Park Farm, 2.8km south east of Abbas Combe, near Wincanton, Dorset. Bristow et al, 1995. 
Reference(s):
Bristow, C R, Barton, C M, Freshney, E C, Wood, C J, Evans, D J, Cox, B M and Woods, M A. 1999. The Wincanton district - a concise account of the geology. Memoir of the British Geological Survey, Sheet 297 (England and Wales). 
Bristow, C R, Barton, C M, Freshney, E C, Wood, C J, Evans, D J, Cox, B M, Ivimey-Cook, H C, and Taylor, R T. 1995. Geology of the country around Shaftesbury. Memoir of the British Geological Survey, Sheet 313 (England and Wales). 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E313 E281