| Computer Code: |
GARW |
Preferred Map Code: |
notEntered |
| Status Code: |
Index Level |
| Age range: |
Caradoc Series (O4)
— Caradoc Series (O4) |
| Lithological Description: |
[Obsolete] Cleaved blue shales, ash and shales with sporadic ashy shales and thin ashes. |
| Definition of Lower Boundary: |
Drawn at base of cleaved blue shales where they rest conformably on calcareous blue mudstones and shales of the Llandeilo Limestone. |
| Definition of Upper Boundary: |
Drawn at (possible unconformity) upward passage from shales, ashy shales and ashes to shales and mudstones of the Gwern-feifod Group. |
| Thickness: |
Not recorded. |
| Geographical Limits: |
Powys, Wales. |
| Parent Unit: |
none recorded or not applicable
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Area |
Garwallt, Powys, Wales. |
| Reference(s): |
| Cantrill,T C, and others. 1914. Denbighshire and Shropshire district. Summary of Progress of the Geological Survey of Great Britain, for 1914, p.7. |
| 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
|
