The BGS Lexicon of Named Rock Units — Result Details

Ogof Hen Formation

Computer Code: OGH Preferred Map Code: OgH
Status Code: Pending Upgrade
Age range: Arenig Series (OR) — Arenig Series (OR)
Lithological Description: Sandstones and sandy mudstones; basal conglomerate locally.
Definition of Lower Boundary: Unconformable.
Definition of Upper Boundary: Not defined.
Thickness: Up to 400 metres.
Geographical Limits: 1:50,000 Sheet 209 (St.David's) and adjacent Sheet 210.
Parent Unit: Not Applicable (-)
Previous Name(s): Brunel Beds (BRU)
Abercastle Beds [Obsolete Name And Code: Use OGH] (ACA)
Porth Gain Beds (-4233)
Alternative Name(s): none recorded or not applicable
none recorded or not applicable
Kokelaar, B P, Bevins, R E and Roach, R A. 1985. Submarine silicic volcanism and associated sedimentary and tectonic processes, Ramsey Island, south west Wales. Journal of the Geological Society of London, Vol.142 (4-6), 591-617. 
Hughes C P, and others. 1982. Abereiddi Bay and the adjacent coast. "In" Bassett, M G. (Editor). Geological excursions in Dyfed, south-west Wales. p.51-63. 
Jenkins, C J. 1979. Not published. Ph.D. Thesis, University of Cambridge. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E210 E209