| Computer Code: |
MN |
Preferred Map Code: |
Mn |
| Status Code: |
Index Level |
| Age range: |
Arnsbergian Substage (CG)
— Arnsbergian Substage (CG) |
| Lithological Description: |
Coarse-grained sandstone (grit). |
| Definition of Lower Boundary: |
Drawn at the base of the coarse-grained sandstone where it rests on shales (containing Nuculoceras nuculum) above the Nesfield Sandstone. |
| Definition of Upper Boundary: |
Drawn where the coarse-grained sandstone is overlain by shales (containing Homoceras beyrichianum) below the Brocka Bank Grit. |
| Thickness: |
c.70m |
| Geographical Limits: |
West Yorkshire area [Middleton, 2.5km northwest of Ilkley, Yorkshire.]. |
| Parent Unit: |
Silsden Formation (SILS)
|
| Previous Name(s): |
Middleton Grit Group [Obsolete Name And Code: Part Of SILS; See Also MN]
(MDGT)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Area |
Around Middleton, 2.5km northwest of Ilkley, Yorkshire. |
| Reference(s): |
| Stephens, J V, Mitchell, G H and Edwards, W N. 1953. Geology of the country between Bradford and Skipton. Memoir of the Geological Survey of Great Britain, Sheet 69 (England and Wales). |
| Stephens, J V and others, 1942. The faunal divisions of the Millstone Grit Series of Rombalds Moor and neighbourhood. Proceedings of the Yorkshire Geological Society, Vol.24, p.347. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
E069
|
