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Sizev_McJol

Jellyfish?

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Sizev_McJol

Unfortunately I don’t have much useful detail to share with you here. I found this in Illinois at the bottom of a bridge filled with slabs of rock blasted from God-knows-what quarry. It other slabs like it contained fragments of brachiopod shells and calymene trilobites. It is about 4 1/2cm in diameter. 

 

My best guess was a jellyfish or something similar; a geologist whom I showed it to agreed, but honestly neither of us were at all confident in our assessment. Thoughts? 

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E5B1B4F8-3536-4E69-840B-E2BFFEED3B59.jpeg

40BEB619-D73D-4165-9724-373795404346.jpeg

CBA0AEFA-4AE6-4026-9682-9A935B80DC27.jpeg

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sixgill pete

I may be wrong, but I really do not believe that is a jellyfish. Jellyfish are soft bodied creatures, and fossil ones I have seen are more like imprints / impression type fossils. This seems to be something "hard" on the rock. But, I am by no means even vaguely familiar with these type of fossils.

 

maybe @Nimravis can help.

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Fossildude19

From the texture, I would guess bryozoan.  :unsure: 

 

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sixgill pete
2 minutes ago, Fossildude19 said:

From the texture, I would guess bryozoan.  :unsure: 

 

 

Looking at it again, I think you may be on to something Tim.

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Sizev_McJol
10 minutes ago, Fossildude19 said:

From the texture, I would guess bryozoan.  :unsure: 

 

Really? I have hundreds of bryozoans but never saw one like this. Wow. Any clue what kind? 

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Nimravis

The only jellyfishes that I know of in Illinois are those found a Mazon Creek, and this is definitely not from there. It does have a weird texture and I can see what @Herb and @Fossildude19 are seeing.

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abyssunder

That's it, Herb. :)

Receptaculitid.

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WhodamanHD
13 minutes ago, Herb said:

dasyclad sponge

The “S” word! 

 

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Herb

A couple common Illinois sponges, there are about a dozen kinds.

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Sizev_McJol

These are all good ideas. I will try to refine my search by looking for various corals from the area. Thank you all so much! If you have any other suggestions, please have at it!

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