But how many of us can place that event in the context of the entire dramatic year in which it took place? From the death of Edward the Confessor in early January to the Christmas coronation of Duke William of Normandy, there is an almost uncanny symmetry, as well as a relentlessly exciting surge, of events leading to and from Hastings.

    Written with clarity and a dazzling intellectual passion, it is both a seminal work of modern geology and a compelling precursor to Darwinism, exploring the evidence for radical changes in climate and geography across the ages and speculating on the progressive development of life. A profound influence on Darwin, Principles of Geology also captured the imagination of contemporaries such as Melville, Emerson, Tennyson and George Eliot, transforming science with its depiction of the powerful forces that shape the natural world.