Gneiss Rocks

Gneiss Rocks found at Ceann an Eanaigh (Annagh Head), a Wild Atlantic Way discovery point, are the oldest rocks on mainland Ireland. The gneiss here are 1,753 million years old!

Gneiss is a high grade metamorphic rock, meaning that it has been subjected to higher temperatures and pressures than schist. It is formed by the metamorphosis of granite, or sedimentary rock.