The BGS Lexicon of Named Rock Units — Result Details
Fawes Wood Limestone Formation
| Computer Code: | FWL | Preferred Map Code: | FWL |
|---|---|---|---|
| Status Code: | Full | ||
| Age range: | Holkerian Substage (CQ) — Holkerian Substage (CQ) | ||
| Lithological Description: | The Fawes Wood Limestone Formation comprises mid to dark grey biomicrosparites and biomicrites (calcarenite, mainly grainstone and packstone) with silty or stylolitic partings and some porcellaneous micrites. Shallow marine carbonate. Holkerian. | ||
| Definition of Lower Boundary: | The formation conformably overlies the sandstones of the Ashfell Sandstone and biosparites of the Tom Croft Limestone formations. | ||
| Definition of Upper Boundary: | The formation is conformably overlain by the limestones with interbedded sandstones, siltstones and numerous thin beds of mudstone of the Garsdale Limestone Formation. | ||
| Thickness: | The formation ranges in thickness from 80.77 m in the River Clough to 55.80 m in the Beckermonds Scar Borehole (Dunham and Wilson, 1985). | ||
| Geographical Limits: | Askrigg Block. | ||
| Parent Unit: | Great Scar Limestone Group (GSCL) | ||
| Previous Name(s): | Horton Limestone (B) [Obsolete Name and Code: Use FWL, GAL]
(HRTL)
Horton Limestone (A) [Obsolete Name and Code: Use FWL, GAL] (HTNL) |
||
| Alternative Name(s): | none recorded or not applicable | ||
| Stratotypes: | |||
| Reference Section | River Clough, Garsdale [SD 6967 9129 to 6961 9134] where the formation comprises biomicrites and medium-grained limestones 80.77 m thick (Burgess, 1986, p. 11; Dunham and Wilson, 1985, p. 28). | ||
| Reference Section | Part of the Beckermonds Scar Borehole (BGS Registration Number SD88SE/1) [SD 8636 8016] from about 143 to 200 m depth, where the formation comprises mid-dark grey limestone, chiefly medium-grain calcarenite (Wilson and Cornwell, 1982, p. 64). | ||
| Reference Section | BGS Raydale Borehole (BGS Registration Number SD98SW/1) [SD 9626 8474] from about 158 to 235 m depth. Dunham and Wilson (1985, p. 28) summarised the formation as comprising about 56-81 m of dominantly dark grey and grey fine-grained grainstones and packstones with a few mudstone and siltstone beds. | ||
| Reference(s): | |||
| Burgess, I C. 1986. Lower Carboniferous sections in the Sedbergh district, Cumbria. Transactions of the Leeds Geological Association, Vol. 11, 1-23. | |||
| Wilson, A A and Cornwell, J D. 1982. The Institute of Geological Sciences borehole at Beckermonds Scar, North Yorkshire. Proceedings of the Yorkshire Geological Society, Vol.44, 59-88. | |||
| Dean, M T, Browne, M A E, Waters, C N and Powell, J H. 2011. A lithostratigraphical framework for the Carboniferous successions of northern Great Britain (onshore). British Geological Survey Research Report, RR/10/007. 165pp. | |||
| Waters, C N, Gillespie, M R, Smith, K, Auton, C A, Floyd, J D, Leslie, A G, Millward, D, Mitchell, W I, McMillan, A A, Stone, P, Barron, A J M, Dean, M T, Hopson, P M, Krabbendam, M, Browne, M A E, Stephenson, D, Akhurst, M C, and Barnes, R P. 2007. Stratigraphical Chart of the United Kingdom: Northern Britain. (British Geological Survey.) | |||
| Dunham, K C, and Wilson, A A. 1985. Geology of the Northern Pennine Orefield. Volume 2 Stainmore to Craven. Economic Memoir of the British Geological Survey, Sheets 40, 41 and 50, and parts of Sheets 31, 32, 51, 60 and 61(England and Wales). | |||
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
| E040 | |||