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
|