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
Type Area  New Harbour area, Holyhead, Anglesey. 
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