If you like reading about the Old West, this is about as old as you can get! Here we have figures such as giant sloths, dinosaurs and other such critters which provide the storyline of this big book. Although Keith Thomson does generate some historical interest in the obscure wilderness adventures of the bone diggers and their advance with human Westward movement across the country, the main subject here is paleontology. If that field of science doesn’t excite you, neither will this book. It delivers what it’s meant to, however, and is well presented. If you like fossils, pard, this is just the book for you.