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aek    13
aek

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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Foozil    92
Foozil

Thats unusually well preserved o.O

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westcoast    105
westcoast

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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Al Dente    1,517
Al Dente

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

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supertramp    87
supertramp
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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Arizona Chris    67
Arizona Chris

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

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Doctor Mud    400
Doctor Mud

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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WhodamanHD    349
WhodamanHD

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

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aek    13
aek

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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aek    13
aek

2017-07-16_18_42_19.jpg

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