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

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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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Them red clay piles are heaven on earth
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image.png.0c956e87cee523facebb6947cb34e842.png May 2016  MOTM.png.61350469b02f439fd4d5d77c2c69da85.png.a47e14d65deb3f8b242019b3a81d8160.png.b42a25e3438348310ba19ce6852f50c1.png May 2012 IPFOTM5.png.fb4f2a268e315c58c5980ed865b39e1f.png.1721b8912c45105152ac70b0ae8303c3.png.2b6263683ee32421d97e7fa481bd418a.pngAug 2013, May 2016, Apr 2020 VFOTM.png.f1b09c78bf88298b009b0da14ef44cf0.png.af5065d0585e85f4accd8b291bf0cc2e.png.72a83362710033c9bdc8510be7454b66.png.9171036128e7f95de57b6a0f03c491da.png Oct 2022

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

 

    Tim    VETERAN SHALE SPLITTER

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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.

Bulldozers and dirt Bulldozers and dirt
behind the trailer, my desert
Them red clay piles are heaven on earth
I get my rocks off, bulldozers and dirt

Patterson Hood; Drive-By Truckers

 

image.png.0c956e87cee523facebb6947cb34e842.png May 2016  MOTM.png.61350469b02f439fd4d5d77c2c69da85.png.a47e14d65deb3f8b242019b3a81d8160.png.b42a25e3438348310ba19ce6852f50c1.png May 2012 IPFOTM5.png.fb4f2a268e315c58c5980ed865b39e1f.png.1721b8912c45105152ac70b0ae8303c3.png.2b6263683ee32421d97e7fa481bd418a.pngAug 2013, May 2016, Apr 2020 VFOTM.png.f1b09c78bf88298b009b0da14ef44cf0.png.af5065d0585e85f4accd8b291bf0cc2e.png.72a83362710033c9bdc8510be7454b66.png.9171036128e7f95de57b6a0f03c491da.png Oct 2022

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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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I think it is a dasyclad sponge

O misc pix.jpg

"Absence of evidence is not evidence of absence"_ Carl Sagen

No trees were killed in this posting......however, many innocent electrons were diverted from where they originally intended to go.

" I think, therefore I collect fossils." _ Me

"When you have eliminated the impossible, whatever remains, however improbable, must be the truth."__S. Holmes

"can't we all just get along?" Jack Nicholson from Mars Attacks

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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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That's it, Herb. :)

Receptaculitid.

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13 minutes ago, Herb said:

dasyclad sponge

The “S” word! 

 

“...whilst this planet has gone cycling on according to the fixed law of gravity, from so simple a beginning endless forms most beautiful and most wonderful have been and are being evolved.” ~ Charles Darwin

Happy hunting,

Mason

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

color-plate-d.gif

"Absence of evidence is not evidence of absence"_ Carl Sagen

No trees were killed in this posting......however, many innocent electrons were diverted from where they originally intended to go.

" I think, therefore I collect fossils." _ Me

"When you have eliminated the impossible, whatever remains, however improbable, must be the truth."__S. Holmes

"can't we all just get along?" Jack Nicholson from Mars Attacks

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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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