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Silicified brachiopod measures 2mm. Racine formation. My wild guess is Isorthis sp. but I really don't know.
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These two finds are in one piece of rock found in some roadside rip rap in Kankakee County, Illinois. Based on other fossils I found and knowing what is exposed in quarries nearby, I believe they are from the Silurian Racine Formation. I have never worked with dolomite before, so I would also love to hear any prep advice you have, as well as IDs! The first seems to be a couple of pleura from a Gravicalymene, but is it likely there is more there? The second one has me puzzled- is it a trilobite part, or maybe a brachiopod? It seems like it is symmetrical, but covered by the matrix. Thanks!