Cleveland is known for many things: the Rock Hall, LeBron James, Playhouse Square. But it’s also known worldwide for its fish, and we’re not talking walleye and perch. The shale layers below Cleveland contain the world’s best preserved fossils of a monster fish that once terrorized the shallow sea covering ancient Ohio. In this week’s Exploradio, WKSU’s Jeff St.Clair marks the 50th anniversary of the effort to save these fossils from being buried under acres of concrete. It was a race against