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
|
Stratotypes: |
Type Area |
Sheet 151, Welshpool, Hope Valley. |
Reference(s): |
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: |
E165
|