connorp Posted July 19, 2020 Share Posted July 19, 2020 Not sure if this bone is identifiable whatsoever. It is from the LaSalle Limestone (Late Pennsylvanian) in Illinois. There is not much original bone remaining but there is a decent impression of (at least part of) what is missing. The lack of non-cartilaginous fish from this unit makes me suspect tetrapod (which have been reported), but I'm not sure if this bone can be identified anatomically. Any thoughts are appreciated. Link to comment Share on other sites More sharing options...
connorp Posted July 19, 2020 Author Share Posted July 19, 2020 Link to comment Share on other sites More sharing options...
westcoast Posted July 19, 2020 Share Posted July 19, 2020 I suspect that is an acanthodian spine Link to comment Share on other sites More sharing options...
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