The BGS Lexicon of Named Rock Units — Result Details

Porth yr Ysgraf Ophiolitic Formation

Computer Code: PYY Preferred Map Code: notEntered
Status Code: Full
Age range: Tremadocian Age (OTR) — Floian Age (OFL)
Lithological Description: Metabasaltic rock, locally pillowed, with metacarbonate rock locally.
Definition of Lower Boundary: Tectonic contact: forms hangingwall to the Hen Felin Thrust.
Definition of Upper Boundary: Stratigraphic contact with overlying Cemlyn Bay Formation (CMEL).
Thickness: none recorded or not applicable
Geographical Limits: Anglesey.
Parent Unit: Llanfechell Group (LFEC)
Previous Name(s): none recorded or not applicable
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