From the natural geometry of the Giant''s Causeway to the sarsen slabs used to build Stonehenge, we are surrounded by evidence for the extraordinary geological forces that shaped the British Isles. Running coast to coast through Devon is ''Sticklepath'', Britain''s ''San Andreas'', a geological fault with the two sides displaced horizontally by several kilometres, all within the recent geological past. The Sticklepath Fault is just one manifestation of the rich tectonic history of the British region since the asteroid collision that ended the reign of the dinosaurs, 66 million years ago. Raised out of the Chalk Sea, the original Albion was a thickly forested island a thousand kilometres long, surrounded by chalk cliffs, punctuated with great volcanoes, and the site of two trial ''spreading ridge'' plate-boundaries. As the volcanoes shifted west, and Greenland separated from Europe, the wind-blown volcanic ash laid the strata on which London was founded. The vertical Needles, known to every Isle of Wight sailor, are part of the northern foothills of the Pyrenees. When the collision subsided, rifting created a garland of Celtic lakes from Brittany to the Outer Hebrides.In This Volcanic Isle Robert Muir-Wood explores the rich geological history of the British Isles, and its resulting legacy. Along the way he introduces the personalities who shared a fascination for Britain''s tectonic history, including Charles Darwin the geologist, Tennyson the science-poet, and Benoit Mandelbrot, the pure mathematician who labelled the west coast of Britain a fractal icon. Here is the previously untold story of how earthquakes and eruptions, plumes and plate boundaries, built the British Isles.