The BGS Lexicon of Named Rock Units — Result Details

Porth Trecastell Formation

Computer Code: TRCA Preferred Map Code: notEntered
Status Code: Full
Age range: Furongian Epoch (EF) — Tremadocian Age (OTR)
Lithological Description: Schistose semipelite and subsidiary psammite and quartzite, with at least one unit of metalimestone; also contains units of metabasic rock, including amphibolite.
Definition of Lower Boundary: Generally sheared; possible locally unconformable on Neoproterozoic units, e.g. Llyn Maelog Group (LMG).
Definition of Upper Boundary: Unconformably overlain by Bodorgan Formation (BODO) or younger units.
Thickness: none recorded or not applicable
Geographical Limits: Anglesey.
Parent Unit: Not Applicable (-)
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