The BGS Lexicon of Named Rock Units — Result Details

New Harbour Group

Computer Code: NNH Preferred Map Code: notEntered
Status Code: Pending Upgrade
Age range: Ediacaran Period (AD) — Ediacaran Period (AD)
Lithological Description: Fissile green mica schist, gritty green mica schist, with bedded jasper, jaspery phyllite and pelitic lava.
Definition of Lower Boundary: Drawn at the base of the New Harbour Group where it rests conformably upon the Rhoscolyn Formation (turbidites).
Definition of Upper Boundary: Drawn at the conformable upward passage from the top of the New Harbour Group to the overlying Skerries Formation of the Skerries Group.
Thickness: 2000m
Geographical Limits: Western and northern parts of Anglesey and eastern Holy Island.
Parent Unit: Monian Supergroup (N)
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  New Harbour area, Holyhead, Anglesey. 
Reference(s):
Greenly E. 1919. The geology of Anglesey, Vol 1. Memoir of the Geological Survey of Great Britain (England and Wales). (London: H.M.S.O.). 
Shackleton, R M, 1954. The structure and succession of Anglesey and the Lleyn Peninsula. British Association for the Advancement of Science, Vol.11, p.106-108. 
Harris, A L, 1975. A Correlation of Pre-Cambrian Rocks in the British Isles. Geological Society of London Special Report, No.6. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
none recorded or not applicable