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KelseyM posted a topic in Fossil IDThis may be a silly question, but how do I know if something is actually a fossil or just a weird shaped rock? Also, if anyone knows - how do these weird shaped rocks form in the slate/shale if they aren't fossils? Not looking for an ID (yet!), just trying to figure out how all the weirdly shaped rocks came to be! I went hiking with my mom in our backyard because she found what we believe to be nautiloid fragments (link to ID thread) and we wanted to see if we could get more. Well we found lots of oddly shaped rocks, but are unsure if they are actually anything. If it helps, we are in a creek in Groveland, Livingston County, New York. A geologist friend said that creek bed looks like shale slate. The only thing we pulled out that I have pictures of right now is a long wormy looking one. One picture of it in the rock and three after we got it out. I haven't been able to take any pictures with size reference sorry I don't have it with me right now, but from memory I'd estimate it's at least ~12-15 cm (5-6 inches). Thanks!