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Hello! I went fossil hunting with my brother and found a tooth shaped cone! We live in rock county of Luverne Minnesota, about 30 minutes away from Sioux Falls South Dakota. We went to a local river nearby that has a sandy riverbank with lots of different kinds of rocks. We have found a lot of small fossils of shells and some coral-like shapes. I found it near the water where it likely washed up. I assumed it was maybe a coral piece because I don’t know anything about teeth. But Google shows a lot of similar images from both teeth and some coral. I’m just not sure how to go about narrowing down what it is. It has distinct circular rings (like a tree) on the top. The pointy end appears to be broken or chipped. It appears to be just about 3 centimeters long. As much as we both want it to be a cool tooth or something we’re just assuming it’s coral, we really have no idea! Thanks for any help or advice! I can answer more questions and take more pictures if necessary!

Found this on Ponte Vedra Beach near Jacksonville FL. I have no idea what it is. The under side is smooth. Any help is appreciated!

Just curious if anyone can help my kids identify this tooth that they found while out on a nature walk around our hometown of Fort Myers, FL. Thank you for any comments and for helping my 3 kids with this!