aek

Sponge?

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Found in a quarry near Rockford, Illinois, Ordovician, Galena group. It looks like a sponge, but I can't seem to find a match. Any help appreciated. spongejpg.thumb.jpg.5b08d5996f688187268d91829515cc2a.jpgspongespicules.thumb.jpg.7dde8e4f28c276f009a51031d7bc400d.jpg

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Thats unusually well preserved o.O

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Strange preservation. Doesn't look Ordovician but I am not familiar with the area. Could you show a picture of the other sides?

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I think it is a mineral deposit and not a fossil. 

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1 hour ago, Al Dente said:

I think it is a mineral deposit and not a fossil. 

Yes, some "coralloidal" specimen

Ciao

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Did you dissolve that one out with the pool acid in a piece of limestone?

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This reminds me of tufa. A calcium carbonate deposit. It can precipitate around plant structures as plants can change the chemical environment leading to calcium carbonate precipitation.

 

 

In this case it could have precipitated around plant roots. If it is Tufa, it could be modern. It would also react to acids e.g. Vinegar.

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Wow, whatever it turns out to be it looks exactly like a modern sponge.

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Thanks for the replies everyone. It was found loose on quarry floor, I rinsed it with water and let it air dry when I got home. Here are some more pics. Thanks for any additional info!

2017-07-16_18_40_31.jpg

2017-07-16 18.40.49.jpg

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2017-07-16_18_42_19.jpg

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