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): |
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: H.M.S.O.). 88pp. |
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. |
1:50K maps on which the lithostratigraphical unit is found, and map code used: |
E133
|