Is it legal for a person to search for fossils in and around the state parks located on Fort Peck Lake? Can a person take a boat and hunt for fossils in some of the more remote regions of the lake? It's technically the Missouri River, so as long as you don't go above the high water mark you're not trespassing as far as I know. In the book "Rise and Fall of the Dinosaurs" the author said you can find several T Rex teeth in a day just walking around the Hell Creek formation.