The BGS Lexicon of Named Rock Units — Result Details

Teilia Formation

Computer Code: TLB Preferred Map Code: notEntered
Status Code: Full
Age range: Brigantian Substage (CX) — Brigantian Substage (CX)
Lithological Description: Interbedded calcareous mudstones and dark grey, tabular-bedded, argillaceous limestones containing a pectinoid bivalve and goniatite fauna. The Teilia Formation represents a basinal, turbiditic and hemipelagic marine mudstone facies, which onlapped the northern margin (including knoll reefs) of the North Wales Dinantian platform during the Brigantian.
Definition of Lower Boundary: Entry of thicker mudstones and dark limestones above conformable contact with thin-bedded limestones of the Prestatyn Limestone Formation; locally rests on"knoll reef" limestones.
Definition of Upper Boundary: Conformable contact with bedded cherts of the Pentre Chert Formation.
Thickness: To 90m
Geographical Limits: Prestatyn area, northeast Wales [SJ 0781]
Parent Unit: Craven Group (CRAV)
Previous Name(s): Black (Aberdo) Limestone [Obsolete Name And Code: Use TLB] (BL)
Teilia Beds (-2486)
Black Limestone (-572)
Alternative Name(s): none recorded or not applicable
Partial Type Section  Disused quarry, westsouthwest of Teilia; now largely degraded, the quarry formerly exposed a c.8m section close to the base of the formation. Warren et al. (1984) 
Warren, P T, Price, D, Nutt, M J C and Smith, E G. 1984. Geology of the country around Rhyl and Denbigh. Memoir for 1:50 000 geological sheets 95 and 107 and parts of sheets 94 and 106. 
Hind, W and Stobbs, J T, 1906. The Carboniferous succession below the Coal Measures in north Shropshire, Denbighshire and Flintshire. Geological Magazine, Vol 5, 387-400, 445-459, 496-507. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E096 E095