During a geological period called the Devonian 350 million years ago, much of was what is now Michigan was covered by a warm shallow tropical sea. There were numerous reefs and beaches. Creatures lived and died here during the passage of time. Millions of years of sediment were deposited, subsequently covering these rich fossil beds and ancient coral reefs. Thanks to the numerous ice ages that followed, sediment was scraped away, exposing these coral reefs once again. The Michigan Basin is rich in paleontological history. Let your students see and hear about the rich paleontological history Michigan has to offer. Hear stories about the varied creatures that once inhabited these ancient tropical seas that covered much of the Midwest.