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Understand this may just be a rock but nothing around in the creek bed matches what this looks like. Not sure if it’s some sort of shell concretion or what. Just wondering if anyone had any thoughts.

Hi everyone, I just returned from a summer in northern New Jersey and had the chance to fossil hunt at the Ramanessin Brook site near Holmdel, New Jersey. We went on 7/28 after a series of heavy rainstorms, so we knew we would have an easy time at finding recently exposed material. We found the usual cretaceous shark teeth fossils, and then perching on the river rocks was this beautiful lower jawbone. I have included a photo of how it was found and the general site area. The jawbone itself does not appear fossilized with minerals and looks quite porous, while I am assuming the dentine in the teeth was well fossilized and has unique hues of blue, red, and brown that are difficult to capture in the photo. The size and specialization of the teeth remind me of a more modern mammal like a raccoon, but I am from Texas and unfamiliar with what is possible to find at this usually marine cretaceous locality. Is it possible that a more recent mammal's jawbone had fossilized and become uncovered in the same area? I am excited to see what you experts are thinking, and thank you in advance! I would be happy to take more photos if needed.