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Recently I took a trip up to central New Jersey in the US with my sister for our 2nd trip fossil hunting; at a place called “big brook preserve”. As I was sifting through looking at some fossils that I could identify such as shark teeth and fossilized poop with my very basic studying from the Internet and stuff I’ve seen on tv. She calls me over at something she had found while sifting through the dirt in the brook. Thinking that I’d be able to identify it for her I was stumped. it looks like it has characteristics of a fossil from what I think but with my limited knowledge and understanding I keep going back to the idea of “nah it can’t be” And thinking it’s just a cool rock. Either way the water seemed to do a number on this this find eroding it over the years. Also the finds in this brook are usually Cretaceous period specimens and the occasional dinosaur fossil is rare, and reptile fossils are a tiny bit rare too here I think. I have a couple pictures that I took that night when we returned home. I’ll take better lit pictures if these aren’t adequate enough, but the main question I have that’s been bothering me is; is it a rock or a fossil from something once living? Side note the front is slightly smoothed/curved and the back is mostly flat. Please and thank you to anyone willing to help. I’ve also taken the time since then to email 2 local universities for assistance too if that’s even possible.