Found this in a small hill/ banks on side of creek in the Grove city, Ohio area. Bone is heavy rock about 13 inches long. Feels like calcite, up close looks like bone spurs. Rough feeling. Also found what I thought was some sort of crayfish, or Crestacian , later saw pics of mmmoth teeth and saw similarities. My thought was large bone maybe young mammoth or mastodon femur bone with tooth. Tooth is like 3 to 4 inches long. I am really new , and have really gotten into fossil hunting in rivers and creek beds. Was watching discovery channel so decided to dig into glacier like hill that sits along creek edge. Can anyone help. Any advice. Pretty sure from what I have read by texture and look this is very old bone. Prob not dinasour found in Midwest. Lol unfortunately. Thank you