The BGS Lexicon of Named Rock Units — Result Details

Aymestry Group

Computer Code: AGP Preferred Map Code: notEntered
Status Code: Full, pending ratification
Age range: Ludlow Epoch (SU) — Ludlow Epoch (SU)
Lithological Description: Grey nodular limestones with siltstone bands in the lower part passing upwards into massive blue hearted crystalline limestones passing into grey nodular limestones. The middle is very fossiliferous.
Definition of Lower Boundary: Drawn at the base of the Aymestry Group where nodular limestone conformably rests upon flaggy calcareous siltstones with fine-grained limestone nodules of the Lower Ludlow Shales.
Definition of Upper Boundary: Drawn at the conformable upward passage of the Aymestry Group where nodular limestones pass into olive green and buff flaggy siltstones of the Upper Ludlow Shales.
Thickness: Max thickness 70 metres approx.
Geographical Limits: The south Shropshire area including Aymestry, Herefordshire.
Parent Unit: Not Entered (?)
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  From the southern edge of the Church Stretton district at Saddle Hill about 1.5kms east of Clungunford, to the Northern limit near Henmoor Hill. 
Reference(s):
Watts, W W, 1925. The Geology of south Shropshire. Proceedings of the Geologists' Association, Vol.36, 321-363. 
Elles, G L and Slater, I L, 1906. The highest Silurian rocks of the Ludlow district. Quarterly Journal of the Geological Society of London, 61, 195-221. 
Cocks, L R M, 1989. The geology of South Shropshire. Proceedings of the Geologists' Association, Vol.100 (4) p.505-519. 
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. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
none recorded or not applicable