| Computer Code: |
HYS |
Preferred Map Code: |
Hys |
| Status Code: |
Pending Upgrade |
| Age range: |
Abereiddian Stage (O2)
— Abereiddian Stage (O2) |
| Lithological Description: |
Interbedded sequence of grey shales, vitroclastic acid tuffs and volcaniclastic sandstones and wackes. |
| Definition of Lower Boundary: |
Lower boundary is passage from Mytton Flags Formation into dark shales of the Hyssington Volcanic Formation shale. |
| Definition of Upper Boundary: |
No upper boundary because of unconformity. |
| Thickness: |
c.1000 metres, much variation. |
| Geographical Limits: |
Not defined. |
| Parent Unit: |
Hope Shale Formation (HOSH)
|
| Previous Name(s): |
Hyssington Volcanic Formation [Obsolete Name and Code: Use HYS]
(-3485)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Area |
Sheet 165, SO39SW. |
| 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
E151
|
