[Knockdow]

Fingal's Cave is a sea cave on the uninhabited island of Staffa, in the Inner Hebrides of Scotland, part of a National Nature Reserve owned by the National Trust for Scotland. It is formed entirely from hexagonally-jointed basalt columns, similar in structure to (and part of the same ancient lava flow as) the Giant's Causeway in Northern Ireland, and those of nearby Ulva. In both cases, the cooling surface of the mass of hot lava cracked in a hexagonal pattern in a similar way to drying mud cracking as it shrinks, and these cracks gradually extended down into the mass of lava as it cooled and shrank to form the columns which were subsequently exposed by erosion.

Legend has it that the Irish giant Fionn mac Cumhaill (Finn McCool) built the causeway to walk to Scotland to fight his Scottish counterpart Benandonner. One version of the legend tells that Fionn fell asleep before he got to Scotland. When he did not arrive, the much larger Benandonner crossed the bridge looking for him. To protect Fionn, his wife Oonagh laid a blanket over him so he could pretend that he was actually their baby son. In a variation, Fionn fled after seeing Benandonner's great bulk, and asked his wife to disguise him as the baby. In both versions, when Benandonner saw the size of the 'infant', he assumed the alleged father, Fionn, must be gigantic indeed. Therefore, Benandonner fled home in terror, ripping up the Causeway in case he was followed by Fionn.

Giants causeway in Antrim, N Ireland






Isle of Staffa in Scotland

[Knockdow]

[Knockdow]

the ride back to Iona

[MacPatrick]

As an individual who has spent many years in the Heavy Construction industry and a lot of the years of his life rooting around in the earth looking for solid rock at the bottom of excavations, I think this geological formation is one of the most interesting I have ever seen.

Do you have any information on the geology of this region? I'm wondering how these rock formations were formed.

[Knockdow]

found this on wickepedia

It is formed entirely from hexagonally-jointed basalt columns, similar in structure to (and part of the same ancient lava flow as) the Giant's Causeway in Northern Ireland, and those of nearby Ulva. In both cases, the cooling surface of the mass of hot lava cracked in a hexagonal pattern in a similar way to drying mud cracking as it shrinks, and these cracks gradually extended down into the mass of lava as it cooled and shrank to form the columns which were subsequently exposed by erosion.

[MacPatrick]

The repetition of these rock formations is spectacular, the volcanic lava explanation make perfect sense and explains the depth of the layer.

[Karen]

This set of photos, one word .... FASCINATING!

Thanks George