Geology
The Cyclopean Isles are of volcanic origin, and may at one time have been attached to Sicily. The lava forming the basaltic columns was consolidated under great pressure, probably at the bottom of the sea.
The Cyclopean Isles strongly resemble the Giant's Causeway on the northern coast of Ireland, and the Isle of Staffa off the western coast of Scotland. The latter, closest in appearance to the Cyclopean pair, differ mainly in having the columns piled in terraces, one above another.
Read more about this topic: Cyclopean Isles