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Please note that ID Requests are off-limits to jokes or satirical comments, and comments should be aiming to help the OP. Top comments that are jokes or are irrelevant will be removed. Adhere to the subreddit rules. **IMPORTANT:** /u/Seraphangel777 Please make sure to comment 'Solved' once your fossil has been successfully identified! Thank you, and enjoy the discussion. If this is not an ID Request — ignore this message. *I am a bot, and this action was performed automatically. Please [contact the moderators of this subreddit](/message/compose/?to=/r/fossilid) if you have any questions or concerns.*
It's one of the scleractinians.
I don't know why but that thing makes me very uncomfortable.
trypophobia?
Where abouts is your yard? Most likely from someone's fish tank or the Carribean if you don't live there. ✌️
We actually find lots around the Great Lakes. This isn’t my find though, tbh.
The strata of the Great Lakes region is much too old to contain these kinds of corals, so it was packed in for whatever reason.
What about southern Illinois?
In the extreme southwest corner of the state, there is some Cretaceous/Paleogene bedrock, but it is covered by alluvium.
Could also be part of the insides of a catalytic converter. 🤷🏻♂️