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 please click on the Application Form clipboard icon (left) Membership normally costs only £15 per year. (Students/school pupils free) 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 Tholeiitic Basalt. Home NEWS Winter Summer Links Resources Archive About Contact Galleries