The BGS Lexicon of Named Rock Units — Result Details

Porthygwichiad Formation

Computer Code: PYGW Preferred Map Code: notEntered
Status Code: Full
Age range: Floian Age (OFL) — Darriwilian Age (ODW)
Lithological Description: Dark grey, thinly interbedded turbidite mudstone and laminated hemipelagic mudstone with units of burrow mottled turbidite mudstone and hemipelagic mudstone.
Definition of Lower Boundary: Unknown - not exposed. Unit is likely lateral equivalent to Capel Parc Formation (CAPC).
Definition of Upper Boundary: Stratigraphic contact with Porth y Corwgl Member - CORWG (Capel Parc Formation).
Thickness: none recorded or not applicable
Geographical Limits: Anglesey.
Parent Unit: Llyn Alaw Group (ALAW)
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