The BGS Lexicon of Named Rock Units — Result Details

Pared Mawr Member

Computer Code: PDM Preferred Map Code: PM
Status Code: Pending Upgrade
Age range: Arenig Series (OR) — Arenig Series (OR)
Lithological Description: Dominantly coarse-grained, locally conglomeratic, bioturbated sandstones, with minor mudstone.
Definition of Lower Boundary: Underlain unconformably by interlaminated sandstone and mudstone of the Ceiriad Formation (Mawddach Group).
Definition of Upper Boundary: Overlain gradationally by thickly bedded pale-weathering sandstones of the Trwyn yr Wylfa Member (St Tudwals Formation).
Thickness: 15 to 37m
Geographical Limits: Pwllheli area, northwest Wales.
Parent Unit: St Tudwal's Formation (STUD)
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Type Section  Pared Mawr, in the area near Pwllheli. 
Young, T P, Gibbons, W and McCarroll, D. 2002. Geology of the country around Pwllheli. Memoir of the British Geological Survey, Sheet 134 (England and Wales). 
1:50K maps on which the lithostratigraphical unit is found, and map code used: