Tievebulliagh

Tievebulliagh is a mountain in the Glens of Antrim, Northern Ireland, formed from a volcanic plug whose intense heat created a tough, fine-grained porcellanite. Neolithic peoples established an axe factory at its base, roughing out axe heads before finishing them at the seashore for export. Porcellanite axes from this quarry have been found from the Outer Hebrides to Orkney and the south coast of England. The Malone Hoard, 19 polished porcellanite axes found upright in the ground in Belfast, likely originated here and may have served ceremonial purposes. The site is a Scheduled Historic Monument.