| Computer Code: |
GFT |
Preferred Map Code: |
notEntered |
| Status Code: |
Full |
| Age range: |
Costonian Substage (OO)
— Harnagian Substage (OG) |
| Lithological Description: |
Coarse- to fine-grained welded felsic crystal lapilli tuff. |
| Definition of Lower Boundary: |
Conformably overlies the felsic Gwern Feifod Lava Member (Llangynog Formation). |
| Definition of Upper Boundary: |
Conformably and gradationally overlain by volcaniclastic mudstones of the main part of the Llangynog Formation. |
| Thickness: |
About 10m |
| Geographical Limits: |
none recorded or not applicable
|
| Parent Unit: |
Llangynog Formation (LGF)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| none recorded or not applicable |
| 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
|
