Arenig
English
Etymology
The term was first used by Adam Sedgwick in 1847 with reference to the "Arenig Ashes and Porphyries" in the neighbourhood of Arenig Fawr, in Merioneth, North Wales.
Proper noun
Arenig
- (geology) A time interval during the Lower Ordovician period.
- Synonym: Arenigian
- A locality in Llanycil community, Gwynedd, Wales, historically in Merionethshire (OS grid ref SH8339).