Mystery Fossil

Data: Hello there, my name is Ron and I am hoping you can help identify what this fossil is on a rock I found some time ago. I attached a photo or two, hope you can help!

Thanks, Ron from Canada

Send Ideas to: Ron





  • Ron's fossil may be the trace of a trilobite left in mud, but that is a guess at best.. It looks sort of like the 'book' gills of a horseshoe crab, but that is extremely unlikely. ...Allen A.

  • Probably a pteriomorph bivalve with strong concentric sculpture, such as an inoceramid. ...Dr. David C.

  • Ron's bivalve belongs in Inoceramidae. It could well be Jurassic Retroceramus. ... Andrew G.


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