Upheavals in the earth's crust formed the sediments into crystalline schists within the roots of an elongated mountain belt. Regional uplift and erosion have since brought the rocks to the surface.

How was Connemara marble formed?

Connemara marble was formed from sediment deposited in a shallow primal sea over 600 million years ago. These sediments were transformed by formidable forces generated in the formation of the mountains of the West of Ireland and Scotland over 390 million years ago!

Was Connemara a volcano?

Located in Connemara, this glacial lake lies on the site of the former 'Finny Volcano' (490 million years ago) where pillow-lava formations, breccia, and other volcanic rocks are still present. Situated on the border of County Mayo, it lines the Maumturk and Partry Mountains.