Poulnabrone Dolmen
Glacio-karst landscape features, which are the combined result of glacial activity and rainwater dissolution features, are abundant around Poulnabrone Dolmen. 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 has been active since then, there is evidence that karst processes were operating in warmer interglacial periods before the last ice age.
Poulnabrone Dolmen
Glacio-karst landscape features, which are the combined result of glacial activity and rainwater dissolution features, are abundant around Poulnabrone Dolmen. 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 has been active since then, there is evidence that karst processes were operating in warmer interglacial periods before the last ice age.