You can contact us by Email at: belfastgeologists@live.co.uk - or just turn up at one of our lectures or trips! If you’d like a membership application form now click here Membership costs only £20 per year. Giant’s Causeway, County Antrim.  The top of one of the famous columns at Northern Ireland’s only World Heritage site.  These were produced by shrinking and cracking at the bottom of a very thick and uniform lava flood, about 57 million years age.  Technically the rock is a Tholeitic Basalt. About us Summer prog. Winter prog. Contact us Useful links Home Giant's Causeway - top of column