Geology of Ireland longest known free-hanging stalactites. 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
Canso Causeway employees operate the swing bridge across the Canso Canal. Canso Causeway The Canso Causeway ("Cabhsair Chanso" in Gaelic) is a rock-fill causeway in Nova Scotia, Canada. The causeway crosses the Strait of Canso, connecting Cape Breton Island by road to the Nova Scotia peninsula. Its crest thickness is , carrying the two vehicle traffic lanes of the Trans-Canada Highway, Nova Scotia Highway 104 on the mainland side, and Nova Scotia Highway 105 on the Cape Breton side, as well as the single track mainline of the Cape Breton and Central Nova Scotia Railway. Constructed in an "S" shape, the causeway