The BGS Lexicon of Named Rock Units — Result Details

Scottsquar Member

Computer Code: SQAR Preferred Map Code: Sq
Status Code: Full
Age range: Aalenian Age (JA) — Aalenian Age (JA)
Lithological Description: Pale grey and brown medium- to coarse-grained peloid, ooid and shell fragment packstone and grainstone ('Upper Freestone'), with beds and lenses of grey to white, commonly highly fossiliferous marl/carbonate mudstone ('Oolite Marl'). These occur throughout the succession, though particularly in the lower part. Fauna dominated by brachiopods; characteristic fossils include the plicate terebratulid brachiopod Plectothyris.
Definition of Lower Boundary: Upward change from ooid grainstone (Cleeve Cloud Member) to marl or limestone as described in lithology; junction marked by hardground.
Definition of Upper Boundary: Upward rapid transition to Harford Member generally by increasing sand and decreasing calcareous content, or: hardground overlain by Aston Limestone Formation or Salperton Limestone Formation.
Thickness: Typically 5 to 10m. Type section; 2.4m (Mudge, D C, 1978a) to 3.6m (Baker, P G, 1981). Maximum c.30m (Colesbourne area).
Geographical Limits: Cotswolds Hills: north of Nailsworth and Cirencester, west of Stow-on-the-Wold and Northleach. (Barron, A J M, et al, 1997, fig.4).
Parent Unit: Birdlip Limestone Formation (BLPL)
Previous Name(s): Oolite Marl Member (-3691)
Combined Oolite Marl And Upper Freestone (-3045)
Oolite Marl Series (-3046)
Scottsquar Hill Limestone Member (-3047)
Oolite Marl [Obsolete Name And Code: See SQAR] (OOM)
Upper Freestone [Obsolete Name And Code: See SQAR] (UFR)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Section  Scottsquar Hill Quarry, Painswick, Gloucestershire. Beds 2 and 3 of Mudge, D C, 1978b. See also Baker, P G, 1981. 
Type Area  Mid and north Cotswold Hills, Gloucestershire. 
Reference Section  Notgrove Station railway cutting, Notgrove, Gloucestershire. Buckman, J, 1887, section 1; Woodward, H B, 1894; Baker, P G, 1981; Barron, A J M. 1998, appendix 1, locality T. For further reference sections see Barron, A J M, et al, 1997. 
Reference(s):
Barron, A J M, Sumbler, M G and Morigi, A N, 1997. A revised lithostratigraphy for the Inferior Oolite Group (Middle Jurassic) of the Cotswolds, England. Proceedings of the Geologists' Association, Vol.108, 269-285. 
Buckman, S S, 1887. The Inferior ooilte between Andoversford and Bourton-on-the-Water. Proceedings of the Cotteswold Naturalists' Field Club, Vol.9, 108-135. 
Parsons, C F, 1976. Ammonite evidence for dating some Inferior Oolite sections in the North Cotswolds. Proceedings of the Geologists' Association, 87, 45-63. 
Barron, A J M, 1998. Geology of the Hawling area: 1:10 000 Sheet SP02SE. British Geological Survey Technical Report WA/98/26. 
Baker, P G, 1981. Interpretation of the Oolite Marl (Upper Aalenian, Lower Inferior Oolite) of the Cotswolds, England. Proceedings of the Geologists' Association, Vol.92, 169-187. 
Mudge, D C, 1978. Stratigraphy and sedimentation of the Lower Inferior Oolite of the Cotswolds. Journal of the Geological Society of London, Vol.135, 611-627. 
Woodward, H B, 1894. The Jurassic Rocks of Britain, Vol.4. The Lower Oolitic Rocks of England (Yorkshire excepted). Memoir of the Geological Survey of the United Kingdom. 
Buckman, J, 1842. Sketch of the Oolite formation of the Cotteswold range of hills, near Cheltenham. The Geologist. Vol.1, 199-208. 
Buckman, S S, 1895. The Bajocian of the mid-Cotswolds. Quarterly Journal of the Geological Society of London, Vol.51, 388-445; 458-462. 
Hull, E, 1857. The geology of the country around Cheltenham. Memoir of the Geological Survey of Great Britain. Old Series Sheet 44. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E235 E217