Computer Code: | SMGP | Preferred Map Code: | ST |
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Status Code: | Full | ||
Age range: | Namurian Stage (CN) — Namurian Stage (CN) | ||
Lithological Description: | Cyclical repetition of sandstones, siltstones, mudstones, thin limestones and some coals. | ||
Definition of Lower Boundary: | Conformable: taken at the top of the uppermost limestone beds of the Great Limestone Member, which are overlain by a sequence of dark grey siltstones and mudstones at the base of the Stainmore Formation. | ||
Definition of Upper Boundary: | Conformable: base of Subcrenatum Marine Band or equivalent. | ||
Thickness: | To 1000m | ||
Geographical Limits: | Northeast England. | ||
Parent Unit: | Yoredale Group (YORE) | ||
Previous Name(s): | Millstone Grit And Upper Limestone Group
(-2433)
Hensingham Group [Obsolete Name And Code: Use SMGP] (HGP) |
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Alternative Name(s): | none recorded or not applicable | ||
Stratotypes: | |||
Type Section | Argill Beck (base) and Mousegill Beck (top): section NY81SW/7 of Burgess, I C and Holliday, D W, 1979, p43. | ||
Reference(s): | |||
Burgess, I C and Holliday, D W. 1979. Geology of the country around Brough-under-Stainmore. Memoir for 1:50 000 geological sheet 31 and parts of sheets 25 and 30. Geological Survey of Great Britain (England and Wales). [London: HMSO.] 131pp. | |||
1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
E013 E049 E010 E040 E041 E020 E014 |