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Anyone know what this is?

That looks a lot like a Pachyphyllum sp. colonial rugose coral, but the problem is that Pachyphyllum sp. is associated with the Devonian. The Fort Campbell area has been mapped to the Mississippian. Lithostrotion sp. corals are indicative of the Mississippian formations in the area but it doesn’t look like that. More views may help to confirm that, especially a shot looking straight down at the top of the specimen. I’m not an expert on corals so its probably a genus I’m not familiar with, or there are many other potential explanations such as it’s been transported from somewhere else, etc.

Horn coral colony.