The BGS Lexicon of Named Rock Units — Result Details

Menevian Group
Computer Code: MEN Preferred Map Code: Men
Status Code: Index Level
Age range: St David's Epoch (ED) — St David's Epoch (ED)
Lithological Description: Dark grey, laminated, commonly pyritous mudstones, with paler tuffaceous horizons locally, passing upwards into coarse turbiditic sandstones and interbedded mudstones in the upper part of the Group.
Definition of Lower Boundary: Conformable and gradational on the sandstones of the Solva Group.
Definition of Upper Boundary: Conformable and gradational with the interbedded sandstones and mudstones of the Lingula Flags Formation.
Thickness: 230m
Geographical Limits: Pembrokeshire; 1:50 000 Sheet 209 (St.David's).
Parent Unit: Not Applicable (-)
Previous Name(s): Menevian Beds (-4789)
Menevian Series (-1062)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Section  Cliff section at Porth-y-rhaw, Pembrokeshire. Cox et al, 1930. 
Reference(s):
Rushton, A W A. 1974. The Cambrian of Wales and England, 43-121 in Holland, C H (editor), The Cambrian of the British Isles, Norden and Spitzbergen (Lower Palaeozoic rocks of the world, 2). [London: John Wiley and Son.] 
Cox, A H, Green, J F N, Jones, O T and Pringle, J. 1930. The St David's District: Report of the summer meeting 1930. Proceedings of the Geologists' Association, Vol.41, 412-438. 
Stubblefield, C J. 1959. Lexique Stratigraphique Internationale. Vol 1: Europe, 3a, England and Wales and Scotland: III Cambrian. [Paris: Centre National de la Recherche Scientifique.] 95pp. 
Cox, A H, Green, J F N, Jones, O T and Pringle, J. 1930. The Geology of the St David's district, Pembrokeshire. Proceedings of the Geologists' Association, Vol.41, 241-273. 
Williams, T G. 1934. The Precambrian and Lower Palaeozoic rocks of the eastern end of St David's Precambrian area Pembrokeshire. Quarterly Journal of the Geological Society, London, Vol.90, 32-75. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E209 E210
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