This small, yet informative, booklet takes you on a four-mile walk to 13 sites and through 15 million years of Earth history. The Mortimer Forest Trail is a geology trail in Shropshire that is famous for its outstanding fossils and varied geology. The trail mostly examines Silurian formations such as the Wenlock and Ludlow series.

The Geologists’ Association is making something of a name for itself when it comes to pushing the envelope in geological publishing in the UK. It has already produced guides to the geology of non-UK locations and I have reviewed a new guide to the roadside geology of Wales. In itself, that was quite a departure, but so is the book under review – a guide to the ‘urban geology’ of Barcelona.