Lying off the south-western tip of Mull, the island of Iona has
huge significance as the first important centre of Christianity in
Scotland. 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 McKirdy
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 and glens of the
Ardnamurchan peninsula and Glen More on Mull; and the Ice Age, when
glaciers ripped away much of the upper part of the two volcanoes
and sandpapered the landscape to create the rounded contours we see
today.
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