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

Identified:

Discussions:

• 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.