Mazon Concretion ID

[Tales From the Shale]

Hello all, this is a small concretion I broke by hand from the Mazonia Braidwood locale.

Concretion is 1.1 inch or 2.42 cm in diameter.

I'm thinking it's simply empty, however in the event it was a hard to see jellyfish I figured I'd ask.

I think animals usually appear as white carbonized silhouettes but some of the jellyfish appear colored.

 

Edited March 6, 2023 by Tales From the Shale

[connorp]

I don't see an obvious fossil here.

There is no such thing as the "Mazon Creek Formation". Mazon Creek fossils refer to fossils originating from the Francis Creek Shale Member of the Carbondale Formation.

[Tales From the Shale]

13 hours ago, connorp said:

I don't see an obvious fossil here.

There is no such thing as the "Mazon Creek Formation". Mazon Creek fossils refer to fossils originating from the Francis Creek Shale Member of the Carbondale Formation.

Oops my bad, I meant to say the locality in which it originated, Mazona Braidwood. These fossils from that site seem to be really difficult and ambiguous at times, hence why I asked. Thank you though