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Hmmm. It does look like the end of a small femur, but I don’t see the honeycomb structure found in bone. Typically bone fossils will be eroded to some degree, and will show a structure of tiny holes going down through the center of the entire bone, with only a very thin layer of bone wall surrounding it. It looks like this bone has a signifigant ammount of wear, and I don’t see any holes. It could possibly be bone, and I am just not seeing those holes, but unless you know the formation, its impossible to know for sure