If you get no definitive answer here I'd suggest a rock and gem shop for ID. When I lived in S. Texas my young son came home with a "rock" and showed my wife what he found. She wanted to throw it away stating it was an "old dried up dog turd". Yes, it DID kinda look like it! He showed it to me and I agreed with him, not doggy dodo. To prove us wrong she took to a rock and gem shop in a town nearby. Turned out it was a lava bomb (volcanic bomb), from an ancient volcano nearby (66+ million years!). Ya never know what cool thing ya may have!
p.s. I'm guessing it could be a fossilized animal track.