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I collected this sample of what might be an example of a   Rhynchonellid  on one of our  trips to Indiana.  It came from  our favorite spot in Madison, and abandoned railroad road cut, so that made it Ordovician. As you can see from the scale, it's a tiny thing! The detail in the sutures is amazing. This is about as specific as I can get. My Index Fossils of North America didn't show anything looking exactly like my critter, so I went with the Berkley's general classification.

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