Need help with a hard rock fossil.

[Mich. Wolverine]

For starters I have never posted on this forum but when I lived on the farm I collected fossils when we picked up the rocks in the fields and they were all coral. I now live in Northeastern lower Michigan on the Lake Huron shore. I found this hard stone rock with some fossils in it and had to keep it. I would like to know what you think they might be. It looks like it might be some sort of clam shells but I have no clue. Thanks for any help in solving this mystery.
Wolverine.

 

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[mamabear]

I can't help you with ID, but I would have kept it too. Interesting . I'm sure someone will be able to help. If you are interested in ID'ing your finds, you might want to invest in the National Audubon Societies Guide to Fossils. It's a good one to have on hand.

 

[old digger]

Just from my observation it does not look like a fossil, JMO. Hard to say, but possibly some type of natural occurrence like another larger rock hitting it and spalling it off.

 

[Harry Pristis]

Dunno! It is so worn that it's difficult to even hazard a guess.