| Computer Code: |
MYTT |
Preferred Map Code: |
MtT |
| Status Code: |
Full |
| Age range: |
Caradoc Series (O4)
— Caradoc Series (O4) |
| Lithological Description: |
Massive, pale grey, fine-grained tuff. |
| Definition of Lower Boundary: |
Underlain by mudstones of the Llangynog Formation. |
| Definition of Upper Boundary: |
Overlain by mudstones of the Llangynog Formation. |
| Thickness: |
c. 3.5m at Blaen-y-cwm, thins eastward (Wedd et al., 1929). |
| Geographical Limits: |
Central Berwyn Hills of Oswestry (137) and Bala (136). |
| Parent Unit: |
Llangynog Formation (LGF)
|
| Previous Name(s): |
Mynydd-Tarw Ash [Obsolete Name and Code: Use MYTT]
(-1720)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Area |
Outcrops around Blaen-y-cwm. |
| Reference(s): |
| Wedd, C B, Smith, B, King, W B R and Wray, D A. 1929. Geology of the country around Oswestry. Memoir of the Geological Survey of Great Britain, Sheet 137. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
E136
E137
|
