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Lake Michigan find


WisconsinGems

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Looks like a piece of chert, to me.

May have been a gastropod or rugose coral, at one time,  but I am not sure that you can say for sure which.

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I agree with Tim. Looks like it might have been something at one point, but it is too weathered to say what.

I also agree that it has the look of chert on the broken part.

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I'm pretty sure it's a solitary rugose coral. You can see short septa on the wide end (at around 12 seconds), as well as from the side.
Clear photos are generally better for ID than videos. :)   

Edited by TqB
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Tarquin      image.png.b7b2dcb2ffdfe5c07423473150a7ac94.png  image.png.4828a96949a85749ee3c434f73975378.png  image.png.6354171cc9e762c1cfd2bf647445c36f.png  image.png.06d7471ec1c14daf7e161f6f50d5d717.png

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