| Computer Code: |
TAH |
Preferred Map Code: |
TAH |
| Status Code: |
Full |
| Age range: |
Tremadoc Series (O1)
— Tremadoc Series (O1) |
| Lithological Description: |
Unevenly bedded flaggy, micaceous siltstones and mudstones. Locally irregularly laminated. Strong bioturbation. |
| Definition of Lower Boundary: |
Gradational from the underlying and overlying mudstones of the Afon Gam Formation. |
| Definition of Upper Boundary: |
Gradational from the underlying and overlying mudstones of the Afon Gam Formation. |
| Thickness: |
c 50m. |
| Geographical Limits: |
Not defined. |
| Parent Unit: |
Dol-cyn-afon Formation (DYN)
|
| Previous Name(s): |
Tai-Herion Flags [Obsolete Name and Code: Use TAH]
(-3709)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Area |
1:50 000 Sheet 120, Corwen. |
| Reference(s): |
| Fearnsides, W G. 1905. On the geology of Arenig and Moel Llyfnant. Quarterly Journal of the Geological Society, Vol.61, 608-640. |
| Zalasiewicz, J A. 1981. The stratigraphy and palaeontology of the Arenig area, North Wales. Unpublished PhD thesis, University of Cambridge. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
E120
|
