Incredibly preserved piece of ± 11.8 x 6.3 cm, the fossil measures ± 8.4 x 1.3 cm. They are soft-bodied animals and very difficult to find fossilized.
* It is a fossil sea cucumber (Holothuroidea) from the 300 million year old Mazon Creek fauna. It is preserved inside an iron nodule.
Carboniferous(Pennsylvanico-Missouriano) ,Francis Creek Shale, Carbondale Formation
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