Lewisian Gneiss Rocks - Isle of Lewis - Isle of Harris
Lewisian Gneiss, one of the oldest rocks in Great Britain, three billion years old, two thirds the age of the earth - Read about the geology of the Outer Hebrides - The Isle of Lewis and The Isle of Harris Rocks and The Callanish Stones
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Isle of Lewis Geology - The Rocks of Lewis and The Isle of Harris
The Geology of the Outer Hebrides is really important - as the predominant rock type is a Lewisian Gneiss - a metamorphic rock which is astonishingly up to 3 billion years old, making it the oldest rock in Britain - two thirds the age of the Earth.