This is the fifth book in Joey’s adventures. Joey and his class go on an excursion to an Archaeological dig site on the other side of town. Archaeological means they are looking for things belonging to people that lived near the town, a long time ago. But when Joey gets to the site, he finds out that it is also a Paleontological dig. They are looking for Dinosaurs too! Joey quickly becomes involved in the project, and works on including it into the dinosaur adventures with his dad. All while keeping the secret of his blue Tractor/Time Machine !