Can anyone ID this fossil with just one photo?

[mn9000]

Sorry about only posting one photo, I took several photos with my phone but they were all well out of focus except for this single photo. I may not be able to post more for a few days since the fossil is about an hour away at the moment so I'm hoping someone can nail it with the solo photo. Thanks in advance!

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[old digger]

It's hard to tell, but could be cronoid or horn coral fossil.

 

[Charlie P. (NY)]

I'm thinking edge of a horn coral as well.

 

[Lygore]

Yep. Horn coral

 

[A2coins]

Good Id

 

[Reanm8er]

Cool! Reminds me of "Name that tune!" LOL