The BGS Lexicon of Named Rock Units — Result Details

Blaen Eidda Member [Obsolete: use CEI]

Computer Code: BEI Preferred Map Code: BEI
Status Code: Index Level
Age range: Longvillian Substage (OL) — Longvillian Substage (OL)
Lithological Description: [Obsolete: use CEI] Green calcareous, volcaniclastic, planar to low-angle cross-bedded fine- to medium-grained sandstone. Multiple shell coquinas.
Definition of Lower Boundary: Base of sandstone overlies grey siltstones and fine-grained sandstones of the Carn y Parc Formation.
Definition of Upper Boundary: Top of sandstone overlain by yellowish-grey sandy siltstones of the Eidda Formation.
Thickness: Thickness in type section - 2 metres; thickness in lateral variations - 0-2 metres.
Geographical Limits: Not defined.
Parent Unit: none recorded or not applicable
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  Corwen 120. 
Reference(s):
Campbell, S D G. 1983. The geology of an area between Bala and Betws-y-Coed, North Wales. Unpublished PhD Thesis, University of Cambridge. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E120