The BGS Lexicon of Named Rock Units — Result Details

Llanbadrig Formation

Computer Code: LLBG Preferred Map Code: notEntered
Status Code: Full
Age range: Sandbian Age (OSA) — Katian Age (OKA)
Lithological Description: Dark grey hemipelagic and pale grey mudstone with sandstone locally at the base; locally oolitic ironstone.
Definition of Lower Boundary: Unconformable upon Ordovician rocks, eg. Camaes Group (CMS) and older rocks.
Definition of Upper Boundary: Stratigraphic boundary unknown: thrust, faulted or eroded.
Thickness: none recorded or not applicable
Geographical Limits: Anglesey.
Parent Unit: Not Applicable (-)
Previous Name(s): Crewyn Formation (CREW)
Llanbodo Formation (LLBO)
Porth Pridd Formation (PPRID)
Alternative Name(s): none recorded or not applicable
none recorded or not applicable
Bates, D E B. 1974. The structure of the Lower Palaeozoic rocks of Anglesey, with special reference to faulting. Geological Journal, 9(1), 39-60. 
Bates, D E B. 1972. The stratigraphy of the Ordovician rocks of Anglesey. Geological Journal, 8(1), 29-58. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
none recorded or not applicable