Mull, Iona & Ardnamurchan - Landscapes in Stone

Lying off the south-western tip of Mull, the island of Iona has huge significance. 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.