| 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
|
