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): Sedgley Limestone (-637)
Aymestry Rock (-3160)
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):
Ball, H W, 1951. The Silurian and Devonian rocks of Turners Hill and Gornal, South Staffordshire. Proceedings of the Geologists' Association, 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. 
Brandon, A. 1989. Geology of the country between Hereford and Leominster. Memoir for 1:50 000 Geological Sheet 198. 
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