The BGS Lexicon of Named Rock Units — Result Details

Middleton Grit

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
Type Area  Around Middleton, 2.5km northwest of Ilkley, Yorkshire. 
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. 
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). 
1:50K maps on which the lithostratigraphical unit is found, and map code used: