... the study and enjoyment of Geology ... Slemish mountain, Co Antrim.  Microgabbro volcanic plug of Palaeogene age.  N54.881463, W6.097379.  (Microgabbro has the alternative names “dolerite” and “diabase”) Updated 27/02/2018 About us Summer prog. Winter prog. Contact us Useful links Home NEXT LECTURE: 19 MARCH 2018 ENORMOUS VOLCANIC ERUPTIONS <click for details> 2017/2018 MEMBERSHIP SUBSCRIPTIONS NOW DUE. < Click for renewal form>