The BGS Lexicon of Named Rock Units — Result Details

Traeth Bychan Limestone Formation [Obsolete Name And Code: Use CFML]

Computer Code: TRL Preferred Map Code: notEntered
Status Code: Index Level
Age range: Brigantian Substage (CX) — Brigantian Substage (CX)
Lithological Description: Thick units of thinly bedded dark argillaceous limestone with shale bands, interbedded with units of pale massive skeletal limestone.
Definition of Lower Boundary: Lower contact taken at the first palaeosol below the lowest unit of argillaceous limestone and shale marking the boundary with the underlying Penmon Limestone.
Definition of Upper Boundary: Upper contact not exposed.
Thickness: 92.5 metres.
Geographical Limits: Not defined.
Parent Unit: Not Entered (?)
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Section  Cliff sections between Moelfre and Pen-y-Coed centred on Traeth Bychan, Sheet 94. 
Reference(s):
Davies, J R. 1983. The stratigraphy, sedimentology and palaeontology of the Lower Carboniferous of Anglesey. Unpublished PhD thesis, University of Keele. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E094