Poulnabrone Dolmen, County Clare, Ireland
This landscape is the combined result of glacial activity and rainwater dissolution. The limestone pavement has been scraped clean by moving ice sheets and the blocks of limestone known as clints are separated by fissures known as grikes. The grikes are formed by rainwater dissolving thin calcite veins that permeate the limestone. While the last ice sheets melted here almost 16,000 years ago and the karst process had been active since then, there is evidence that karst processes were operating in warner interglacial periods before the last ice age.
-Burren and Cliffs of Moher-