This book is packed full of useful information for students, shark enthusiast and collectors. Compiled from years of research and collecting specimen by Jim & LeAnn Rathbone. The book is in large format so the pictures can be larger for easier learning. The book has over 200 pages, 100's of photos, great illustration. This book is up to date scientifically with the most recent species information, It Covers many Sharks, Hexanchiform, Squaliform, Squatiniformes, Orectolobiform, Narrow Toothed Lamniforms, Broad-toothed Lamniforms, and Carachiniform, Sharks as well as some Rays and Skates. This book shows actual pictures of both modern jaws and teeth and fossil shark teeth NOT just unidentifiable line drawings like most shark reference books, many pictures of jaws and tooth sets as well as information about the sharks themselves. This is a must have book for fossil shark tooth collectors, modern shark tooth collectors and jaw collectors looking for an identification guide.