The BGS Lexicon of Named Rock Units — Result Details

Ffynnon Limestones

Computer Code: FYNL Preferred Map Code: notEntered
Status Code: Index Level
Age range: Lochkovian Age (DO) — Lochkovian Age (DO)
Lithological Description: Calcrete.
Definition of Lower Boundary: none recorded or not applicable
Definition of Upper Boundary: none recorded or not applicable
Thickness: none recorded or not applicable
Geographical Limits: Black Mountains.
Parent Unit: Freshwater West Formation (FWW)
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Stratotypes:
none recorded or not applicable
Reference(s):
Barclay, W J, Davies, J R, Hillier, R D, and Waters, R A. 2015. Lithostratigraphy of the Old Red Sandstone successions of the Anglo-Welsh Basin. British Geological Survey Research Report, RR/14/02. 96pp. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
none recorded or not applicable