To tell the story of Irish Blue Limestone you need to go back about 370 million years. Obviously at that time Ireland was not the green countryside which everyone is now familiar with in the guide books, but rather part of the floor of a shallow inlet of the sea. This inlet lay on the southern edge of a large landmass which included the present day North America, Europe and Asia and was about 5 degrees North of the equator.
During this long geological history the Dinantian sediments changed from soft unconsolidated muds into the limestone beds that underlie much of the central part of Ireland.
All over Ireland ancient monuments can be found from early pre-christian tombs to Christian celtic stone crosses.
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