The BGS Lexicon of Named Rock Units — Result Details

Moelfre Tuff Formation

Computer Code: MOT Preferred Map Code: notEntered
Status Code: Pending Upgrade
Age range: Caradoc Series (O4) — Caradoc Series (O4)
Lithological Description: Basaltic tuff.
Definition of Lower Boundary: Conformable within the upper part of the Nant Ffrancon Subgroup.
Definition of Upper Boundary: Conformable within the upper part of the Nant Ffrancon Subgroup.
Thickness: To 165m
Geographical Limits: Data not yet available.
Parent Unit: Nant Ffrancon Subgroup (NFR)
Previous Name(s): Moelfre Tuff Member (-2944)
Alternative Name(s): none recorded or not applicable
Stratotypes:
none recorded or not applicable
Reference(s):
British Geological Survey. 1989. Llandudno. England and Wales. Sheet 94. Solid and Drift Geology. 1:50 000 Series [Keyworth, Nottingham: British Geological Survey.] 
Rushton, A W A and Howells, M F. 1998. Stratigraphical framework for the Ordovician of Snowdonia and the Lleyn Peninsula. British Geological Survey Research Report, RR/99/08. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E094