The BGS Lexicon of Named Rock Units — Result Details
Farlow Sandstone Formation
| Computer Code: | FRL | Preferred Map Code: | Frl |
|---|---|---|---|
| Status Code: | Full | ||
| Age range: | Famennian Age (DA) — Famennian Age (DA) | ||
| Lithological Description: | Large-scale, planar cross-bedded, yellow sandstone and pebbly sandstone overlain by grey pebbly calcareous sandstone. | ||
| Definition of Lower Boundary: | The lower boundary of the formation is placed at an unconformity where the basal conglomerate sharply overlies red-brown mudstones of the St Maughans Formation (at the type section) or red sandstones of the Brownstones Formation. | ||
| Definition of Upper Boundary: | The upper boundary is placed at an unconformity where the topmost grey sandstones of the formation are sharply overlain by the basal conglomerate of the Carboniferous-age Oreton Limestone Formation (Avon Group). | ||
| Thickness: | The formation is 70 to 154 m thick. | ||
| Geographical Limits: | West of Farlow [SO 63 80] extending eastward to east of Prescott [SO 67 81], Shropshire. | ||
| Parent Unit: | Portishead Subgroup (POB) | ||
| Previous Name(s): | Farlow Sandstone Group
(-5075)
Farlow Group [Obsolete Name and Code: Use FRL] (-4050) Farlow Series (-5076) |
||
| Alternative Name(s): | none recorded or not applicable | ||
| Stratotypes: | |||
| Partial Type Section | Farlow Bank where a 1.2 m-thick basal quartz conglomerate is overlain by 4.9 m of yellow pebbly sandstone [SO 639 807]. Greig et al., 1968. | ||
| Reference Section | Roadside exposures at Prescott, Shropshire [SO 663 812]. Dineley (1999). | ||
| Reference(s): | |||
| 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.) | |||
| Ball, H W, and Dineley, D L. 1961. The Old Red Sandstone of Brown Clee Hill and the adjacent area. Part 1. Stratigraphy. Bulletin of the British Museum (Natural History), Geology Series. [London: British Museum (Natural History).] 177-242. | |||
| Allen, J R L. 1974. Sedimentology of the Old Red Sandstone (Siluro-Devonian) in the Clee Hills area, Shropshire, England. Sedimentary Geology, Vol. 12, 73-167. | |||
| Barclay, W J, Davies, J R, Hillier, R D, and Waters, R A. 2015. Lithostratigraphy of the Old Red Sandstone successions of the Anglo-Welsh Basin. British Geological Survey Research Report, RR/14/02. 96pp. | |||
| 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. | |||
| House, M R, Richardson, J B, Chaloner, W G, Allen, J R L, Holland, C H and Westoll, T S. 1977. A Correlation of Devonian rocks of the British Isles. Geological Society of London, Special Report No.8, Scottish Academic Press, Edinburgh. | |||
| Allen, J R L. 1977. Wales and the Welsh Borders. 40-54 in A correlation of Devonian rocks in the British Isles. House, M R et al. (editors). Geological Society, London, Special Report No. 7. | |||
| Allen, J R L. 1965. Upper Old Red Sandstone (Farlovian) palaeogeography in South Wales and the Welsh Borderland. Journal of Sedimentary Petrology, Vol. 35, 167-195. | |||
| King, W W. 1934. The Downtonian and Dittonian strata of Great Britain and north-western Europe. Quarterly Journal of the Geological Society of London, Vol. 90, 526-570. | |||
| Dineley, D L. 1999. Prescott Corner. 236-238 in Dineley, D L. and Metcalf, S J. (editors). Fossil Fishes of Great Britain. Geological Conservation Review Series No.16. Joint Nature Conservation Committee, Peterborough. | |||
| King, W W, 1925. Notes on the 'Old Red Sandstone' of Shropshire. Proceedings of the Geologists' Association, Vol.36, 383-389. | |||
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
| E166 E167 E181 | |||