Mariel Bard 
Amphibian Fossils [PDF ebook] 

Amphibian fossils tell us a great deal about the frogs, toads, salamanders, and other amphibians that lived on Earth thousands and millions of years ago. With every turn of the page, young fossil enthusiasts will be delighted to see photographs of amphibian fossils and learn how they formed. The text was designed to work hand-in-hand with the photographs and diagrams to provide a comprehensive treatment of this essential elementary science concept. This book also contains sidebars and fact boxes for additional chances to learn.