The BGS Lexicon of Named Rock Units — Result Details
Aymestry Limestone Formation
| Computer Code: | AL | Preferred Map Code: | AL |
|---|---|---|---|
| Status Code: | Full | ||
| Age range: | Gorstian Age (SG) — Gorstian Age (SG) | ||
| Lithological Description: | Blue-grey, nodular argillaceous limestone with greenish shaly calcareous mudstone (at Ludlow). | ||
| Definition of Lower Boundary: | Transitional with Lower Ludlow Shale. | ||
| Definition of Upper Boundary: | Transitional with Upper Ludlow Shale locally; local unconformity in type area; locally at base of yellow ochreous shale in type area (Alexander, 1936). | ||
| Thickness: | 18 metres - 25 metres in Malvern area; up to 45 metres in type area. | ||
| Geographical Limits: | Welsh Borderland, West Midlands, Coalbrookdale and Malverns. | ||
| Parent Unit: | Not Applicable (-) | ||
| Previous Name(s): | Aymestry Rock [Obsolete Name and Code: Use AL]
(-3160)
Sedgley Limestone (-637) |
||
| Alternative Name(s): | none recorded or not applicable | ||
| Stratotypes: | |||
| Type Area | Village of Aymestry, Herefordshire. | ||
| Reference Section | (Brandon, 1989). Full thickness exposed in a large pit on Shucknall Hill. | ||
| Reference Section | (Sedgley Limestone) Beacon Hill Quarry, Sedgley. (Whitehead and Pocock, 1947). | ||
| Type Area | (Alexander, 1936). Aymestry area from Much Wenlock to Mortimer's Cross. | ||
| Reference Section | (Upper Bringewood Formation. Holland, Lawson and Walmsley, loc.45). Old quarry on western bank of River Teme. | ||
| Reference(s): | |||
| Cocks, L R M, Holland, C H, Rickards, R B, and Strachan, I. 1971. A correlation of Silurian rocks in the British Isles. Geological Society of London, Special Report No. 1. | |||
| Brandon, A. 1989. Geology of the country between Hereford and Leominster. Memoir for 1:50 000 Geological Sheet 198. | |||
| Ball, H W. 1951. The Silurian and Devonian rocks of Turners Hill and Gornal, South Staffordshire. Proceedings of the Geologists' Association, 62, 225-236. | |||
| Whitehead, T H and Pocock, R W. 1947. Geology of the country around Dudley and Bridgnorth. Memoir of the British Geological Survey, Sheet 167. (England and Wales). | |||
| Murchison, R I, 1839. 'Silurian System'. [London: John Murray.] | |||
| Alexander, F E S. 1936. The Aymestry Limestone of the Main Outcrop. Quarterly Journal of the Geological Society, Vol. 92, 103-115. | |||
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
| E216 E198 E168 E232 E249 E233 E199 E181 E250 E167 | |||