Dino Dig Daze!

From the introduction: Dino Dig Daze is the ongoing saga about a group of dinosaur ghosts who, by way of an incredibly tragic clerical error, have had their fossilized remains switched out with display quality replicas. Even worse, these actual fossils were bought by a children’s museum, which uses them in their seasonal Dino Dig — an outdoor, interactive exhibit where kids of all ages can brush away sand to reveal fossils like the paleontologists!