The BGS Lexicon of Named Rock Units — Result Details

Stapeley Volcanic Member

Computer Code: SYV Preferred Map Code: SyV
Status Code: Pending Upgrade
Age range: Abereiddian Stage (O2) — Abereiddian Stage (O2)
Lithological Description: Volcaniclastic members and two basaltic-andesite lava/pyroclastic members - the Todleth and Llan Fawr members, (Lynas, 1983).
Definition of Lower Boundary: Overlies Mytton Flags Formation.
Definition of Upper Boundary: Underlies Weston Flags Formation, Middleton Group.
Thickness: Very variable.
Geographical Limits: Not defined.
Parent Unit: Hope Shale Formation (HOSH)
Previous Name(s): Stapeley Volcanic Formation (-3705)
Stapeley Volcanic Group (-3706)
Stapeley Ash (-2470)
Stapeley Member (-2471)
Alternative Name(s): none recorded or not applicable
Stratotypes:
none recorded or not applicable
Reference(s):
Whittard, W F. 1931. The geology of the Ordovician and Valentian rocks of the Shelve Country, Shropshire. Proceedings of the Geologists' Association, Vol.42, 322-344. 
Lapworth, C . 1887. The Ordovician rocks of Shropshire. British Association for the Advancement of Science. Report for 1886. Birmingham Meeting 662. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E165 E151