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The peak is named, in the English language, Slievenaglogh. It is so strange as it’s not English, being instead a transliteration of the Irish name “Sliabh na gCloch.” This is “Rock Mountain” translated literally. Slievenaglogh is carried to the townland, a long thin swath of land being the peak and associated ridge-line.
The rocks up there are called “gabbro,” a type of magma slowly cooled under ground. Slievenaglog, Slieve Foy across the valley, and the Morne mountains all formed within volcano magma chamber(s) of the Paleocene, 66 million years ago, a time associated with extensive volcanism and the Cretaceous–Paleogene extinction event that gave rise to the current age.
Our younger cousin has been up there, optimistically we left it for a later trip.