Digging up sea creature fossils

"Sea creature fossils are particularly interesting because they're often found where there isn't any water! They give scientists insight into how Earth has changed over time-in fact, over millions of years. Readers uncover some of the oldest sea creature fossils in this volume and find out how they formed, where they were found, and what they can tell us about the past, including where water once was and isn't anymore"--Provided by publisher.