He didn’t find any “million year old” fossil. He found a thousands of year old fossil.
Your one of “those”.
Louisiana has Alligoator Gar & Spotted Gar, and they can grow quie large. I think around 10 feet for the Alligator Gar, while the Spotted Gar is like 3 feet. But I don't travel in the Buous, so I am not that gamiliar with them. But I remember seeing them in a tank as Bass Pro Outdoor World, a long time ago, when I stopped in to check it out, just for kicks.