The Lochaber and Glencoe area is rich in historical associations. It was at Glenfinnan that Bonnie Prince Charlie started his long marchsouthwards to lay claim to the British throne, and Glencoe was the scene of one of the most vicious massacres in Scottish history.But a longer and even more turbulent history is played out geologically. Ancient volcanoes erupted in massive explosions, causing shock wavesthat reverberated around the planet. Their eroded...