| 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: |
Arbitrary 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: |
Arbitrary 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 - 19 m. |
| Geographical Limits: |
Trudoxhill (Somerset) to Holwell (Dorset). |
| Parent Unit: |
Peterborough Member (PET)
|
| Previous Name(s): |
Mohuns Park Member [Obsolete Name and Code: Use MPMU]
(-406)
|
| Alternative Name(s): |
Peterborough Member
|
| Stratotypes: |
| Reference Section |
BGS Combe Throop Borehole (ST72SW/1), 2 km eastnortheast of Abbas Combe, near Wincanton, Dorset. 29.6 to 48.7 m depth. Bristow et al., 1995. |
| Type Area |
Mohuns Park Farm [7315 2125], 2.8 km 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
|
