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.
The British upper Ordovician has a spectacular variety of invertebrate fossils. The marine communities in which they lived developed on a number of microcontintents and terranes, associated with tectonically active areas of the Earth’s crust.
This GA guide is stated to be a “Geology Teaching Trail”. Well, it may be, but when I ambled along the trail with the guide in my hand, I certainly wasn’t in a teaching situation. Rather, I was out for a nice walk and a guide to explain what I was seeing. And it did just that and the classic Silurian/Ordovician unconformity you can see was just that. Classic!