Mazon Creek Jellyfish Essexella asherae 57

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Essexella asherae Jellyfish - Positive and Negative impressions

- Outline clearly visible where rock colour changes. Up close you will see more detail.

Middle Pennsylvanian (Carboniferous), Francis Creek Shale, Pit 11, Braidwood, Illinois. USA, Mazon Creek bed nodule deposits. 307 Million years old.