The BGS Lexicon of Named Rock Units — Result Details

Lower Comley Sandstone Formation

Computer Code: LCSS Preferred Map Code: LCmS
Status Code: Pending Upgrade
Age range: Comley Series (EC) — Comley Series (EC)
Lithological Description: Interbedded green, glauconitic and phosphatic shales, sandy mudstones and fine- to coarse-grained calcareous sandstones.
Definition of Lower Boundary: Base of sandstones and mudstones as described under Lithology, resting on grey quartzites of the Wrekin Quartzite; junction is sharp and may be disconformable locally.
Definition of Upper Boundary: Base of shelly glauconitic limestone of the overlying Lower Comley Limestones Formation. Locally an unconformity overlain by the Comley Breccia (bed).
Thickness: 100-150m
Geographical Limits: Church Stretton, Lilleshall, Shropshire.
Parent Unit: Not Applicable (-)
Previous Name(s): Comley Sandstone Group [Obsolete Name And Code: See LCSS And UCSS] (CMS)
Comley Sandstone Series (-2710)
Lower Comley Series (-4150)
Lower Comley Sandstone Group (-3515)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Reference Section  Croft Borehole, Lilleshall, depth 53.95 - 66.6m. 
Partial Type Section  Comley Quarry. 1300m N35E of the summit of Caer Caradoc Hill. 
Reference Section  Church Stretton No 7 Inclined Borehole, depth 73.0 - 245.5m. 
Reference(s):
Greig D C, Wright, J E, Hains, B A and Mitchell, G H. 1968. Geology of the country around Church Stretton, Craven Arms, Wenlock Edge and Brown Clee. Memoir of the Geological Survey, Sheet 166 (England and Wales). (London: H.M.S.O.). 379pp. 
Cowie, J W, Rushton, A W A and Stubblefield, C J, 1972. A correlation of Cambrian rocks in the British Isles. Special Report of the Geological Society of London, No.2, p.26. 
Cobbold, E S. 1927. The stratigraphy and geological structure of the Cambrian area of Comley. Quarterly Journal of the Geological Society, Vol.83, p.560. 
Lapworth, C. 1891. On Olenellus callavei and its geological relationships. Geological Magazine, Vol.8, 532-533. 
Cobbold, E S. 1921. The Cambrian horizons of Comley, Shropshire. Quarterly Journal of the Geological Society of London, Vol.76. 
Brasier, M D, 1989. Sections in England and their correlation. 83 - 104 in Cowie, J W and Brasier, M D (Editors). The Precambrian-Cambrian Boundary. [Oxford University Press.] 
Rushton, A W A, Hamblin, R J O and Strong, G E, 1988. The Croft Borehole in the Lilleshall Inlier of North Shropshire. Report of the British Geological Survey, Vol.19, No.3. 
Wright, J E, 1968. The geology of the Church Stretton area (Explanation of 1:25 000 Geological Sheet SO49). Institute of Geological Sciences. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E152 E166