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Looks like a piece of ammonite or nautilus. The difference is in their chamber patters which I can not see from the image. A nautilus has straight lines like rings around it when are the chamber walls inside. An ammonite has a very intricate and squiggly pattern because it is much stronger than the straight line for living in deeper waters.

Ammonite. The pattern on the end indicates a complex suture pattern.

yes, pretty much seems to be an ammonite fragment