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The Burren is underlain by limestones of the Lower Carboniferous (Visean) period. The limestone formed as sediments in a tropical sea which covered most of Ireland approximately 350 million years ago.
Northern Ireland Geology-Dolerite. Dolerite is a volcanic rock. While similar to basalt, it contains crystals which can be seen with a hand lens. This indicates that it cooled a little more slowly than basalt. Typically it is found in volcanic plugs which channeled the basalt to the surface.Erosion since Tertiary times, 60 million years ago, has exposed these plugs.hile similar to basalt, it contains crystals which can be seen with a hand lens. This indicates that it cooled a little more slowly than basalt. Typically it is found in volcanic plugs which channeled the basalt to the surface. Erosion since Tertiary times, 60 million years ago, has exposed these plugs.