| Computer Code: |
FFA |
Preferred Map Code: |
notEntered |
| Status Code: |
Index Level |
| Age range: |
Abereiddian Stage (O2)
— Abereiddian Stage (O2) |
| Lithological Description: |
[Obsolete: use FFG] Grits, pebbly sands, flags and grits, rhyolitic ashes and lavas,rhyolitic conglomerates. |
| Definition of Lower Boundary: |
Drawn at the base of the Ffairfach Group where grits conformably rest upon mudstones and shales of the Bifidus Member. |
| Definition of Upper Boundary: |
Drawn at the conformable upward passage of the Ffairfach Group where rhyolitic conglomerates are overlain by current bedded sandstones of the Llandeilo Flags Formation. |
| Thickness: |
160 metres max. |
| Geographical Limits: |
Ffairfach, near Llandeilo, Dyfed. |
| 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 |
Area around Ffairfach, Dyfed. |
| Reference(s): |
| Williams, A, 1953. The geology of the Llandeilo district, Carmarthenshire. Quarterly Journal of the Geological Society. Vol.108, p.180, Maps. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
| none recorded or not applicable |
