... the study and enjoyment of Geology ... Creggandevesky court tomb, Tyrone.  Dark stone on left of the gallery is ultrabasic (mantle) rock, not found at outcrop in the area.  Neolithic tomb builders must have retrieved it from glacial drift.  54.619417, -7.000782 Updated 18/10/2018 About us Summer prog. Winter prog. Contact us Useful links Home 19 November IRELAND’S LOST MONSTERS Archive EVENT Next meeting: