A slim volume. Well balanced content – covers all types of fossils – not just dinosaurs. Nice photos, digestible / bite sized facts, large sized print, just 24 pages with inviting cover. Given the focus on showing bite-sized facts there isn't much of a ‘storyline’ to follow through the book. But the book feels very accessible for ages 6+ (vocab is likely a bit advanced for most 5 year olds unless they were advanced readers, really into dinosaurs).