The BGS Lexicon of Named Rock Units — Result Details
Lower Brimham Grit
Computer Code: | LOBM | Preferred Map Code: | LoBm |
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Status Code: | Full | ||
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 30 m. | ||
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 [Obsolete Name and Code: Use LOBM] (-2299) |
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Alternative Name(s): | Lower Plompton Grit |
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Stratotypes: | |||
Reference Section | Hack Fall on River Ure, 2.5 km north of Kirkby Malzeard, North Yorkshire; full succession visible. Wilson and Thompson, 1965. | ||
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(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 |