The Geology is based on the causeway being created by an ancient volcanic event in which the heating and cooling formed the pillars in County Antrim in Northern Ireland.
"Here are no less than forty thousand pillars, fitted together into a vast pavement, the joints of which are so exact that neither falling rain nor beating billows can find space for penetration. The more these columns are examined, the more remarkable they appear. Not only are they fashioned into pentagons and hexagons of perfect geometrical construction, but they are also divided into sections like a bamboo rod, each with a convex surface joined with the utmost nicety to the concave meeting it.........."
"....Standing upon this pavement, laid so many ages ere a human foot was pressed upon its surface, the unseen was to me more marvelous than the seen. For, far away across the water, off the coast of Scotland, lies the island of Staffa, pierced by the far-famed Fingal's Cave"John Stoddard Lectures
The legend of Fionn mac Cumhaill & the Causeway is just one of many stories of his exploits on the Emerald Isle. There were some who compared Fionn to King Arthur and the Knights of the Round Table. Fionn was the leaders of a band of young Gaelic warriors known as Fianna. I have posted links attached to all the names so you can read the stories yourself. You won't be disappointed......especially when Nature & Storytelling combine their forces in these beautiful Gaelic places...