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Incredible coral!

Thanks. I was thinking colonial rugose coral but needed a second opinion.

I think you’re right

@frank-dig colonial rugose coral seems right on the mark! Possibly Lithostrotion. I’d love to add this to our research database if you wouldn’t mind completing the following steps:
Take a photograph of the specimen with a scale. A ruler is preferred, but a coin will do in a pinch.
For the classification column, use the taxon wizard to fill out higher taxonomy. Just put in the most specific identification you feel reasonably confident in, for this one I’d put class Hexacorallia but put colonial rugose coral in common name. If you can figure out a more specific ID feel free to update it.
For the lithostratigraphy, you can use an online tool called Rockd (they have an app and a website). Just find your location on the map and press on it and it will give you the formation and/or group of bedrock in your area. I took the liberty of doing this for you this time, looks like both St. Louis and Warsaw limestone formations are present, it describes them on the app if you want to try to differentiate which one you site falls into, but for now you can put “St. Louis Limestone or Warsaw Limestone” for formation and Meramec Group for group.
For Geochronology, use Rockd as well labeled as age. I did this for you this time, your fossil comes from the Mississippian Period. You should use the geochronology wizard so it fills out all the boxes. If you are having trouble with this, you can manually put in the eon (Phanerozoic) and era (Paleozoic).

Let me know if you have any trouble or question. Tag me when you finish! Thanks for sharing this awesome fossil!
Best,
Mason