Color Overheads Included! The material in this book focuses on the historical development of life as evidenced by fossil specimens. The significance of fossils in interpreting our geologic history is described. Each of the twelve teaching units in this book is introduced by a color transparency, which emphasizes the basic concept of the unit and presents questions for discussion. Reproducible student pages provide reinforcement and follow-up activities. The teaching guide offers descriptions of the basic concepts to be presented, background information, suggestions for enrichment activities, and a complete answer key.