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Genuine Pennsylvanian Age Mazon Creek Jellyfish Nodule from Illinois for Sale #25

Genuine Pennsylvanian Age Mazon Creek Jellyfish Nodule from Illinois for Sale. The fossils are preserved in ironstone concretions, formed approximately 300 million years ago in the mid-Pennsylvanian epoch of the Carboniferous period.

Genuine Mazon Creek Nodule
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