Geology of Ireland Geology of Ireland The geology of Ireland consists of the study of the rock formations in Ireland. The island contains rocks from every age from Proterozoic to Holocene and a large variety of different rock types is represented. The basalt columns of the Giant's Causeway together with geologically significant sections of the adjacent coast have been declared a World Heritage Site. The geological detail follows the major events in Ireland's past based on the geological timescale. The oldest known Irish rock is about 1.7 billion years old and is found on Inishtrahull Island off the north coast of Ulster. Outcrops
Bodorna Rock Columns Natural Monument some resemblance with figure of the Christian monk. Monument origin is not completely clear, as it may be a denudational relict from a neogene conglomerate or from naturally cemented cobbles known as pinnacle or hoodoo that was later altered by man for cult purposes. Detailed lithostratigraphy studies are not available. At the base the rock column has diameter of 4 m and column gradually narrows towards the top. Presently the column surface is covered with shrubbery. The column contains a small cave with two niches, one of many, that were utilized as a shelter by early Christian monks in Georgia,