Computer Code: |
FFR |
Preferred Map Code: |
notEntered |
Status Code: |
Full |
Age range: |
Llandovery Epoch (SL)
— Llandovery Epoch (SL) |
Lithological Description: |
Mudstones and siltstones. |
Definition of Lower Boundary: |
Overlies mudstones of the Laundry Mudstones Formation. |
Definition of Upper Boundary: |
Overlain by pale green-grey mudstones of the Dolgau Mudstones Formation. |
Thickness: |
25 m. |
Geographical Limits: |
Central and northeast Wales. |
Parent Unit: |
Not Applicable (-)
|
Previous Name(s): |
Fron Frys Slates [Obsolete Name and Code: Use FFR]
(-3401)
|
Alternative Name(s): |
none recorded or not applicable
|
Stratotypes: |
Type Section |
Along part of the Nant Llechog, about 2 km southeast of Corwen. |
Reference(s): |
Lake, P and Groom, T. 1893. The Llandovery and associated rocks of the neighbourhood of Corwen. Quarterly Journal of the Geological Society, London. Vol.149, 426-440. |
1:50K maps on which the lithostratigraphical unit is found, and map code used: |
E136
E120
E137
E121
|