What is it?

[Gbonds]

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This is about a inch to inch and a half long and found along a creek in north alabama

 

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[TheCannonballGuy]

Part of a broken Tetracoralla (horn-coral) fossil. Rugosa - Wikipedia, the free encyclopedia

Did you find it anywhere near Ft. Payne AL? I used to fossil-hunt there, especially in the Paint Rock Valley.