| 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. |
| Stratotypes: |
| Type Area |
Village of Aymestry, Shropshire. |
| Reference Section |
(Brandon, 1989). Full thickness exposed in a large pit on Shucknall Hill. |
| Reference Section |
(Upper Bringewood Formation. Holland, Lawson and Walmsley, loc.45). Old quarry on western bank of River Teme. |
| Type Area |
(Alexander, 1936). Aymestry area from Much Wenlock to Mortimer's Cross. |
| Reference Section |
(Sedgley Limestone) Beacon Hill Quarry, Sedgley. (Whitehead and Pocock, 1947). |
| Reference(s): |
| Brandon, A. 1989. Geology of the country between Hereford and Leominster. Memoir for 1:50 000 Geological Sheet 198. |
| Murchison, R I, 1839. The Silurian System, 1, London, p. 201, |
| Whitehead, T H and Pocock, R W, 1947. Dudley and Bridgnorth. Memoir of the Geological Survey of Great Britain. |
| Ball, H W, 1951. The Silurian and Devonian rocks of Turners Hill and Gornal, South Staffordshire. Proceedings of the Geologists' Association, Vol.62, 225-236. |
| 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. |
| Alexander, F E S, 1936. The Aymestry Limestone of the Main Outcrop. Quarterly Journal of the Geological Society, Vol.92, 103-115. |
