The BGS Lexicon of Named Rock Units — Result Details

Tai-Herion Member

Computer Code: TAH Preferred Map Code: TAH
Status Code: Pending Upgrade
Age range: Tremadoc Series (O1) — Tremadoc Series (O1)
Lithological Description: Unevenly bedded flaggy, micaceous siltstones and mudstones. Locally irregularly laminated. Strong bioturbation.
Definition of Lower Boundary: Gradational from the underlying and overlying mudstones of the Afon Gam Formation.
Definition of Upper Boundary: Gradational from the underlying and overlying mudstones of the Afon Gam Formation.
Thickness: c 50m.
Geographical Limits: Not defined.
Parent Unit: Dol-Cyn-Afon Formation (DYN)
Previous Name(s): Tai-Herion Flags (-3709)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  1:50 000 Sheet 120, Corwen. 
Reference(s):
Zalasiewicz, J A. 1981. The stratigraphy and palaeontology of the Arenig area, North Wales. Unpublished PhD thesis, University of Cambridge. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E120