The BGS Lexicon of Named Rock Units — Result Details

Dyffryn Flags Facies (Caban Conglomerate Formation)

Computer Code: DFN Preferred Map Code: Dfn
Status Code: Pending Upgrade
Age range: Hirnantian Age (OH) — Llandovery Epoch (SL)
Lithological Description: Interbedded turbidite mudstones, laminated hemipelagites and abundant thin turbidite sandstones.
Definition of Lower Boundary: Not defined
Definition of Upper Boundary: Not defined.
Thickness: Not defined.
Geographical Limits: Central Wales.
Parent Unit: Caban Conglomerate Formation (CBN)
Previous Name(s): Dyffryn Flags (-1497)
Dyffryn Flags Facies (-4603)
Dyffryn Flags Facies Formation (-3357)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Section  Stream section on north-west slope of Gwastaden Hill, Rhayader. Stream termed the 'Prysg Stream' by Lapworth, (1900). 
Reference(s):
Lapworth, H, 1900. The Silurian sequence at Rhayader. Quarterly Journal of the Geological Society, Vol.56, p.67-137. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E179