Fingal’s Cave, Scotland

                      

How Fingal's Cave was Formed

The question "how was Fingal's Cave formed?" is often posed. Eminent visitors have seriously asserted that it must, because of its regularity and because it points exactly at Iona, have been hollowed out of the island by hand. In fact, the answer is straightforward. Since the layer of rock made up of columns would all have been laid down at one time it follows that when the tilting occurred there would have been pressure above the present site of the cave, and a fissure would have been forced open directly below, where sea now surges in. The violent action of huge waves that would have struck the island during storms over thousands of years developed the fissure, undermining dozens of columns, to create the opening we marvel at today.