The BGS Lexicon of Named Rock Units — Result Details

Hope Group

Computer Code: HOP Preferred Map Code: Hop
Status Code: Pending Upgrade
Age range: Abereiddian Stage (O2) — Abereiddian Stage (O2)
Lithological Description: Dominant grey shaly mudstones and siltstones with two distinctive volcanic formations.
Definition of Lower Boundary: At top of Mytton Flag Formation (Shelve Group).
Definition of Upper Boundary: At base of Weston Flags Formation (Middleton Group).
Thickness: <2000m - variable.
Geographical Limits: Not defined.
Parent Unit: Not Entered (?)
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Type Area  Sheet 151, Welshpool, Hope Valley. 
Cave, R. 1985. Geological notes and local details for 1:10,000 Sheets : Sheet SO39SW (Hyssington and Lydham) : Part of 1:50,000 Sheet 165 (Montgomery) Aberystwyth. Report of the British Geological Survey. 
1:50K maps on which the lithostratigraphical unit is found, and map code used: