The BGS Lexicon of Named Rock Units — Result Details

Lower Brimham Grit

Computer Code: LOBM Preferred Map Code: LoBm
Status Code: Index Level
Age range: Kinderscoutian Substage (CK) — Kinderscoutian Substage (CK)
Lithological Description: A thickly bedded, trough cross-bedded, grey, coarse-grained, feldspathic sandstone and pebbly sandstone; locally, ganister at top.
Definition of Lower Boundary: Sharp upward change in a conformable succession from predominantly grey mudstone to sandstone - base of first sandstone bed in an argillaceous succession above the Ure Shell Bed.
Definition of Upper Boundary: Sharp upward change in a conformable succession from sandstone to predominantly mudstone - top of last sandstone bed below the Upper Brimham Grit.
Thickness: 10 to 30m
Geographical Limits: Pennines foothills southwest and east of Masham [SE2230 8080].
Parent Unit: Hebden Formation (HEBD)
Previous Name(s): Lower Plompton Grit (LPG)
First Brimham Grit (-2299)
Alternative Name(s): Lower Plompton Grit
Stratotypes:
Reference Section  Clints Quarry and cliffs on east side of Leighton Reservior, Ilton Moor, Marsham, North Yorkshire; full succession visible. Wilson and Thompson, 1965. 
Reference Section  Hack Fall on River Ure, 2.5km north of Kirkby Malzeard, North Yorkshire; full succession visible. Wilson and Thompson, 1965. 
Reference(s):
Cooper, A H and Burgess, I C. 1993. Geology of the country around Harrogate. Memoir for 1:50000 geological sheet 62 (England and Wales). London: HMSO for the British Geological Survey. 
Wilson, A A and Thompson, A T. 1965. The Carboniferous section in the Kirkby Malzeard area, Yorkshire. Proceedings of the Yorkshire Geological Society. Vol 35, 203-227. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E051