| Computer Code: |
NHM |
Preferred Map Code: |
notEntered |
| Status Code: |
Index Level |
| Age range: |
Harnagian Substage (OG)
— Harnagian Substage (OG) |
| Lithological Description: |
[Obsolete: use CSW] Mudstones and siltstone. |
| Definition of Lower Boundary: |
Overlies the Aran Volcanic Group. |
| Definition of Upper Boundary: |
Underlies the Cefn Gwyn Tuff. |
| Thickness: |
About 1000m |
| Geographical Limits: |
none recorded or not applicable
|
| 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 |
Nant Hir valley. |
| Reference(s): |
| Bassett, D A, Whittington, H B, and Williams, A. 1966. The stratigraphy of the Bala district, Merionethshire. Quarterly Journal of the Geological Society of London, Vol. 122, 219-271. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
| none recorded or not applicable |
