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Ring of Gullion, Crossmaglen

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Geologic Formation
The Ring of Gullion is a geological formation and area, officially designated as an Area of Outstanding Natural Beauty, (AONB) located in County Armagh, Northern Ireland. The area centres on Slieve Gullion, the highest peak in County Armagh, measures roughly 42 by 18 kilometres (26 by 11 mi) and comprises some 150 kmĀ² defined topographically by the hills of an ancient ring dyke. Parts of the area have also been officially listed as Areas of Special Scientific Interest.The geological formation was the first ring dyke to be mapped, although its significance was not understood until similar structures had been described from Scotland. It was emplaced during the Paleogene opening of the Atlantic Ocean during the formation of the North Atlantic Igneous Province.Geological history and featuresThe structure of the ring dyke was produced when the active volcano's caldera underwent collapse producing a concentric suite of faults providing space into which magma was able to intrude. The ring dyke is composite with both porphyritic granophyre and porphyritic felsite components. The composition of the remainder of the volcano today is dominated by gabbro and granophyre and is also the site of a noted occurrence of platinum group elements.
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TripAdvisor
  • We stayed for two nights recently at Ti Chulainn. We did the loop walk of Slieve Gullion. Wonderful walk with great views of the magical landscape. Great facilities at Slieve Gullion National Park whe...  more »
  • Walking or driving you could not fault the views of the ring of Gullion from start to finish it is outstanding (pity about the coffee shop it's not great)  more »
  • The air is fresh and the sun was shining, great walk for the kids up the hill and round all the fairy houses, the kids absolutely loved it, it's not too steep of a hill walk, (I did the first bit admi...  more »