| Computer Code: |
ULV |
Preferred Map Code: |
ULG |
| Status Code: |
Full |
| Age range: |
Caradoc Series (O4)
— Caradoc Series (O4) |
| Lithological Description: |
Basaltic trachyandesite with rhyolitic tuff. |
| Definition of Lower Boundary: |
Lies conformably on sandstones and siltstones, plus tuffs of the Cwm Eigiau Formation. |
| Definition of Upper Boundary: |
Overlain by siltstones, sandstones and calcareous mudstones of the Dwyfach Formation. |
| Thickness: |
About 500m |
| Geographical Limits: |
Pwllheli area, northwest Wales. |
| Parent Unit: |
Not Applicable (-)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Reference Section |
Exposures near Boduan. |
| 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. |
| Matley, C A and Heard, A, 1930. The Geology of the country around Boduan (south-west Carnarvonshire). Quarterly Journal of the Geological Society of London, Vol.86, 130-168. |
| Young, T P, Gibbons, W and McCarroll, D. 2002. Geology of the country around Pwllheli. Memoir of the British Geological Survey, Sheet 134 (England and Wales). |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
E134
|
