The BGS Lexicon of Named Rock Units — Result Details

Rhindaston And Gignog Group

Computer Code: PH Preferred Map Code: notEntered
Status Code: Full, pending ratification
Age range: Neoproterozoic Era (AZ) — Neoproterozoic Era (AZ)
Lithological Description: Rhyolitic and keratophyric tuffs and lavas.
Definition of Lower Boundary: Drawn at the base of the rhyolitic and keratophyric tuffs and lavas where it rests conformably upon rhyolitic tuffs of the Pont Yr Hafod Group.
Definition of Upper Boundary: Drawn at the conformable upward passage from tuffs and lavas of the Rhindaston and Gignog Group to basal conglomerate of the lower Cambrian Caerfai Group.
Thickness: Not known.
Geographical Limits: Haycastle, west Wales. (Dyfed).
Parent Unit: Not Entered (?)
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Type Area  Haycastle, Dyfed. 
Thomas, H H and Jones, O T, 1912. On the Pre-Cambrian and Cambrian rocks of Brawdy, Haycastle and Brimaston, (Pembrokeshire). Quarterly Journal of the Geological Society of London, Vol.68, 374-401. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
none recorded or not applicable