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

1. (geology) A time interval during the Lower Ordovician period.

   Synonym: Arenigian