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): | Combined Oolite Marl and Upper Freestone [Obsolete Name and Code: Use SQAR]
(-3045)
Oolite Marl Series [Obsolete Name and Code: Use SQAR] (-3046) Scottsquar Hill Limestone Member [Obsolete Name and Code: Use SQAR] (-3047) Oolite Marl [Obsolete Name And Code: See SQAR] (OOM) Upper Freestone [Obsolete Name And Code: See SQAR] (UFR) Oolite Marl Member [Obsolete Name and Code: Use SQAR] (-3691) |
||
| 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. | ||
| 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. | ||
| Type Area | Mid and north Cotswold Hills, Gloucestershire. | ||
| Reference(s): | |||
| Hull, E, 1857. The geology of the country around Cheltenham. Memoir of the Geological Survey of Great Britain. Old Series Sheet 44. | |||
| 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. | |||
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
| E235 E217 | |||