Lying off the south-western tip of Mull, the island of Iona has huge significance as the first important centre of Christianity in Scotl&. But the Abbey itself is built upon rocks that tell of events of much greater antiquity: the Lewisian gneisses of western Iona are some of the oldest rocks in the world. Alan Mc Kirdy explores the fascinating geology of the area
- in particular the eruption of two major volcanoes around 60 million years ago whose magma chambers formed the spectacular hills & glens of the Ardnamurchan peninsula & Glen More on Mull; & the Ice Age, when glaciers ripped away much of the upper part of the two volcanoes & sandpapered the landscape to create the rounded contours we see today.