This is the second Geologists’ Association guide by Professor John Cope. The other is the second edition of his excellent Dorset guide. And, on the grounds that “if it ain’t broken, don’t mend it”, this guide to the south Devon coast follows the highly successful basic plan of that other guide, including the extensive use of colour photos and diagrams.

Dunedin Academic Press has once again added a title to its series of introductions to scientific subjects. This one is a short introduction to an essential subject to any budding geologist (essential, because, as the author points out, 70% of the rocks on the Earth’s service are sedimentary in origin and are of the utmost economic importance to all of us.

I remember reading and enjoying this book when the first edition came out many years ago. I am also a keen hillwalker and have stood on top of many of the Scottish mountains referred to in the text. In fact, I particularly enjoyed climbing Ben More on the island of Mull, which I remember reading was the last volcano in northwest Europe.

Recently, I have finished the Great Silurian Controversy, a magnificent book about the nineteenth century arguments over the age of the lower Palaeozoic greywackes/sediments of Devon, and the creation of the concept of the Devonian. And reading The Lewisian: Britain’s oldest rocks by Graham Park, it occurs to me that this should perhaps be called, The Great Lewisian Controversy. It shares the same historical and scientific intentions, and the same grand sweep of scientific history, this time from the early twentieth century – namely, the exploration over decades of the geology of the Lewisian of northwest Scotland.