| Computer Code: |
WIG |
Preferred Map Code: |
Wig |
| Status Code: |
Full |
| Age range: |
Moridunian Stage (OB)
— Moridunian Stage (OB) |
| Lithological Description: |
Dark grey silty mudstone containing phosphate nodules. |
| Definition of Lower Boundary: |
Conformable on sandstones of the Wig Bach Formation. |
| Definition of Upper Boundary: |
Conformable and gradational with dark grey mudstones of the undivided Wig Bach Formation. |
| Thickness: |
30m |
| Geographical Limits: |
Not yet recorded. |
| Parent Unit: |
Wig Bâch Formation (WGB)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Section |
Wig, Aberdaron Bay. Rushton, A W A and Howells, M F. 1998. |
| Reference(s): |
| Rushton, A W A and Howells, M F. 1998. Stratigraphical framework for the Ordovician of Snowdonia and the Lleyn Peninsula. British Geological Survey Research Report, RR/99/08. |
| Gibbons W, and McCarroll D. 1993. Geology of the country around Aberdaron, including Bardsey Island. Memoir of the British Geological Survey, Sheet 133 (England and Wales). (London: HMSO.) 88pp. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
E133
|
