n nWhen Arthurs third-grade class goes hunting for fossils at Rainbow Rock State Park, Buster actually finds one. Theres just one problem: he wants to keep it. Can Arthur persuade Buster to return the important discovery, or will it stay buried forever in the back of Busters closet?n nIn chapter-book format for children who are ready to read on their own, this hilarious adventure will surely be a hit among Arthur fans.n