The BGS Lexicon of Named Rock Units — Result Details

Dinas Bran Formation

Computer Code: DBG Preferred Map Code: DB
Status Code: Pending Upgrade
Age range: Ludlow Epoch (SU) — Ludlow Epoch (SU)
Lithological Description: Mudstones, sandy, slightly calcareous, micaceous, thinly bedded, uncleaved.
Definition of Lower Boundary: Overlie Vivod Group (or M. Leintwardinensis Beds) of Wills and Smith, 1922. Junction not seen. Vivod Group consists of thinly bedded flaggy mudstones.
Definition of Upper Boundary: None - occurs in the core of the Llangollen Syncline.
Thickness: Up to about 225 m thick.
Geographical Limits: Between Llangollen and Pontcysyllte, Dee Valley (Vale of Llangollen) Clwyd.
Parent Unit: Not Available (!)
Previous Name(s): Dinas Bran Beds (-198)
Dinas Bran Group (-844)
Alternative Name(s): none recorded or not applicable
Type Area  Exposures around Castell Dinas Bran. 
Lake, P, 1895. The Denbighshire Series of South Denbighshire. Quarterly Journal of the Geological Society, Vol.51, p.9-22. 
Wills, L J and Smith, B, 1922. The Lower Palaeozoic Rocks of the Llangollen district with special reference to Tectonics. Quarterly Journal of the Geological Society, Vol.78, p.176-226. 
1:50K maps on which the lithostratigraphical unit is found, and map code used: