The BGS Lexicon of Named Rock Units — Result Details
Porth Trefadog Formation
Computer Code: | POTRF | Preferred Map Code: | notEntered |
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Status Code: | Full | ||
Age range: | Floian Age (OFL) — Darriwilian Age (ODW) | ||
Lithological Description: | Felsic ash flow tuff and tuffaceous sandstone. | ||
Definition of Lower Boundary: | Unconformably overlying Cambro-Ordovican Holy Island Group (NHI) or Llanfechell Group (LFEC) rocks. | ||
Definition of Upper Boundary: | Stratigraphic contact with Porth Swtan Formation (SWTN). | ||
Thickness: | none recorded or not applicable | ||
Geographical Limits: | Anglesey. | ||
Parent Unit: | Cemaes Group (CMES) | ||
Previous Name(s): | Cae Adda Volcanic Formation
(ADDA)
Church Bay Tuffs [Obsolete See: POTRF] (NXCT) |
||
Alternative Name(s): | none recorded or not applicable | ||
Stratotypes: | |||
none recorded or not applicable | |||
Reference(s): | |||
none recorded or not applicable | |||
1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
none recorded or not applicable |