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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.
1 Limestone cliffs or scars are produced at the edge of the area of limestone. 2  Often near vertical and highly jointed. 3  Swallow holes and sink holes are where rivers flow down into the rock. 4  Sink holes are relatively small, whilst swallow holes are larger.ses of a carboniferous limestone area. 1  Poor, thin soils mean that the only type of farming possible in limestone areas is sheep grazing. 2  The tourist industry is a very important source of income to limestone areas. 3  Most people come to walk in the hills and see the spectacular karst sceney.