What is this? A rock, a fossil or both??

[dtinhb]

Found this a couple weeks ago, just curious if you've seen anything like it. It looks like bone on the top with what appear to be bite marks and maybe an ancient version of tic tac toe was played on it previously? lol

 

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[BagLady]

interesting. I think Fossil can be ruled out.

 

[scarriker]

Looks like a map.

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[astralea1692]

Native American Artifact?