I collected this sample of what might be an example of  Ancistrorhyncha  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. Going through my Index Fossils of North America, this was the closest match. The only variable that doesn't work is the location. The authors place the brachiopod in Tennessee, I found it in Indiana.

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