Computer Code: |
PCR |
Preferred Map Code: |
PC |
Status Code: |
Full |
Age range: |
Caradoc Series (O4)
— Caradoc Series (O4) |
Lithological Description: |
Rhyolitic domes, sills and tuffs associated with the Pitts Head Tuff and Llwyd Mawr Tuff. |
Definition of Lower Boundary: |
Overlies sandstones, tuffs and siltstones of the Cwm Eigiau Formation. |
Definition of Upper Boundary: |
Overlain by sandstones, tuffs and siltstones of the Cwm Eigiau Formation or ash-flow tuffs and breccias of the Lower Rhyolitic Tuff Formation. |
Thickness: |
Up to 700m (including the Pitts Head Tuff). |
Geographical Limits: |
Pwllheli area, northwest Wales. |
Parent Unit: |
Pitts Head Tuff Formation (PT)
|
Previous Name(s): |
none recorded or not applicable
|
Alternative Name(s): |
none recorded or not applicable
|
Stratotypes: |
Reference Section |
Pen Ychain, near Pwllheli. |
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
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