Globally significant volcanic event formed Giant’s Causeway, scientists find Geochronologists say basalt columns in Antrim sprang up during volcanic activity over 5.5m years – 8m less than thought The Guardian - UK · Jun 14
Tourists urged to stop jamming coins into iconic Giant’s Causeway rocks Unwanted mementos are causing the 60 million-year-old rocks to crumble, National Trust says The Independent UK · May 28, 2025