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): Lower Comley Sandstone Group (-3515)
Lower Comley Series (-4150)
Comley Sandstone Series (-2710)
Comley Sandstone Group [Obsolete Name And Code: See LCSS And UCSS] (CMS)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Reference Section  Croft Borehole, Lilleshall, depth 53.95 - 66.6m. 
Reference Section  Church Stretton No 7 Inclined Borehole, depth 73.0 - 245.5m. 
Partial Type Section  Comley Quarry. 1300m N35E of the summit of Caer Caradoc Hill. 
Reference(s):
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. 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.] 
Lapworth, C. 1891. On Olenellus callavei and its geological relationships. Geological Magazine, Vol.8, 532-533. 
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. 
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. 
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. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E152 E166