In this April 20, 2012, photo, David Meyer, a professor of Geology at the University of Cincinnati, holds a lobe of a fossil at Caster Library on the campus in Cincinnati. Experts in the U.S. are trying to figure out what the 450 million-year-old fossil dubbed &quot;Godzillus&quot; used to be. The 150-pound fossil recovered last year in Kentucky by amateur paleontologist Ron Fine is more than 6 feet long. (AP Photo/The Cincinnati Enquirer, Gary Landers)  MANDATORY CREDIT;  NO SALES