Yesterday I was sifting in a Big Brook tributary (Marlboro, N.J.) when I spotted in my sifter what looked like very badly battered Enchodus fang. However, when I examined it more closely I spotted the serrations. Not Enchodus. I was originally thinking crab pincher. Crab claws are pretty rare. It certainly wasn't a ghost shrimp, or lobster. The other possibility, even less likely, some type of fish spine. Showed it to a friend who ID it as a rat fish spine: Ischyodus bifurcatus. Can anyone confirm this? I've never seen one before. Other fossils present confirm either Wenonah or Navesink Formations, Upper Cretaceous. The spine is an inch and three quarters long. Thank you.