The BGS Lexicon of Named Rock Units — Result Details
Stockdale Group
| Computer Code: | STK | Preferred Map Code: | Stk |
|---|---|---|---|
| Status Code: | Full | ||
| Age range: | Hirnantian Age (OH) — Llandovery Epoch (SL) | ||
| Lithological Description: | The term Stockdale Group was introduced by Kneller et al. (1994) to include the mudstone and siltstone sequence of latest Hirnantian and Llandovery age which occurs throughout the Lake District, Cross Fell, Cautley and Dent, and Craven inliers. Uppermost Ashgill (Hirnantian in part) and Llandovery. | ||
| Definition of Lower Boundary: | The lower boundary of the group coincides with the base of the Skelgill Mudstone Formation. | ||
| Definition of Upper Boundary: | The upper boundary is defined by the base of the overlying Brathay Mudstone Formation (Tranearth Group). | ||
| Thickness: | Thickness in the southern Lake District is 40 to 120 m, whereas up to 140 m are present in the Howgill Fells, but only 35 m in the Craven inliers. | ||
| Geographical Limits: | Lake District, Cross Fell, Cautley and Dent, and Craven inliers. | ||
| Parent Unit: | Windermere Supergroup (WIN) | ||
| Previous Name(s): | Stockdale Shale Formation [Obsolete Name and Code: Use STK]
(-2413)
Stockdale Shales, Undivided [Obsolete Name and Code: Use STK] (-3661) Stockdale Shales [Obsolete Name and Code: Use CMK, STK] (-4556) |
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| Alternative Name(s): | Stockdale Subgroup [Obsolete: use STK] |
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| Stratotypes: | |||
| Type Area | Stockdale Beck. Reference Sections are as defined for the component Skelgill and Browgill formations. | ||
| Reference(s): | |||
| Arthurton, R S, Johnson, E W, and Mundy, D J C. 1988. Geology of the country around Settle. Memoir of the British Geological Survey, Sheet 60 (England and Wales). | |||
| Aveline, W T, and Hughes, T M. 1888. Geology of the country around Kendal, Sedburgh, Bowness and Tebay. Memoir Geological Survey of Great Britain. | |||
| Ingham, J K, McNamara, K J and Rickards, R B, 1978. The Upper Ordovician and Silurian rocks. 29-44 in Moseley, F (editor) "The Geology of the Lake District". Yorkshire Geological Society, Leeds. | |||
| King, W B R and Wilcockson, W H, 1934. The Lower Palaeozoic rocks of Austwick and Horton-in-Ribblesdale, Yorkshire. Quarterly Journal of the Geological Society of London, Vol.90, 7-31. | |||
| Lawrence, D J D, Webb, B C, Young, B and White, D E. 1986. The geology of the Late Ordovician and Silurian rocks (Windermere Group) in the area around Kentmere and Crook. Includes map, 1:25,000 series, Parts of Sheets NY40 and SD49 Kentmere and Crook, Solid and Drift Geology. Report of the British Geological Survey, 18/5. | |||
| Marr, J E and Nicholson, H A, 1888. The Stockdale Shales. Quarterly Journal of the Geological Society of London, Vol.44, p.654-732. | |||
| Moseley F. 1984. Lower Palaeozoic lithostratigraphical classification in the English Lake District. Geological Journal, Vol. 19, p. 239-247. | |||
| Blackie, R C. 1933. The Silurian rocks of the Kentmere District, Westmorland. Proceedings of the Liverpool Geological Society, Vol. 16, 88-105. | |||
| Furness, R R, Llewellyn, P G, Norman, T N, and Rickards, R B. 1967. A review of Wenlock and Ludlow stratigraphy and sedimentation in NW England. Geological Magazine, Vol. 104, 132-147. | |||
| Harkness, R, and Nicholson, H A. 1868. On the Coniston Group. Quarterly Journal of the Geological Society of London, Vol. 24, 296-303. | |||
| Ingham, J K, and Rickards, R B. 1974. Lower Palaeozoic rocks. 29-44 in The geology and mineral resources of Yorkshire. Rayner, D H, and Hemingway, J E (editors). Occasional Publication of the Yorkshire Geological Society, No. 2. | |||
| Marr, J E. 1887. The Lower Palaeozoic rocks near Settle. Geological Magazine, Decade 3, Vol. 4, 35-38. | |||
| Kneller, B C, Scott R W, Soper N J, Johnson E W and Allen P M, 1994. Lithostratigraphy of the Windermere Supergroup, Northern England. Geological Journal, Vol. 29, 219-240. | |||
| 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.) | |||
| Cocks, L R M, Holland, C H and Rickards, B. 1992. A revised correlation of Silurian rocks in the British Isles. Geological Society of London Special Report. No.21, 32pp. | |||
| Millward, D, and Stone, P. 2012. Stratigraphical framework for the Ordovician and Silurian sedimentary strata of northern England and the Isle of Man. British Geological Survey Research Report, RR/12/04. 119pp. | |||
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
| E038 E040 E048 E039 | |||