West Somerset is an area of great geological diversity, straddling the Tees-Exe Line between highland and lowland Britain. The story of the last 400 million years of Earth history can be gleaned from its rocks: the opening and closing of oceans, the collision of continents and a journey across the Equator. The area may also provide the key to settle the controversy about the origin of South-West England, whose ancient geology is so different from...