Hutton's Arse by Malcolm Rider. Its claim is, I quote:

"3 billion years of extraordinary geology in Scotland's Northern Highlands. This book takes you through those 3 billion years, shows you the rocks, visits the places, introduces some of the famous researchers and presents the geological theories that have been inspired by the Highlands."

It's an astonishing and riveting book. Despite the title, it's a serious though very approachable read, and poor old James Hutton, despite the title, doesn't get many mentions!