| Computer Code: |
BOD |
Preferred Map Code: |
Bdl |
| Status Code: |
Full |
| Age range: |
Caradoc Series (O4)
— Caradoc Series (O4) |
| Lithological Description: |
Rhyolitic crystal-lithic tuffs, rather variable characteristics, strongly welded locally. |
| Definition of Lower Boundary: |
Sudden influx of coarse crystal-lithic tuffs, above strongly welded Nant-y-Gledryd Member, or volcaniclastic sediments of the Yoke House Formation. |
| Definition of Upper Boundary: |
Overlain by volcaniclastic sandstones, breccias of the Yoke House Formation, and locally by Nod Glas Formation. |
| Thickness: |
200-250m |
| Geographical Limits: |
Pwllheli area, northwest Wales. |
| Parent Unit: |
Carneddol Rhyolitic Tuff Formation (CRTU)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Section |
Southwest of Mochras Uchaf. |
| Reference(s): |
| 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
|
