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Mazon Creek Polychaete Worm Astreptoscolex anasillosus 30

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Polychaete Worm Astreptoscolex anasillosus Positive and Negative nodule

Middle Pennsylvanian (Carboniferous), Francis Creek Shale, Chowder Flats, Coal City, Illinois. USA, Mazon Creek bed nodule deposits. 307 Million years old.

See photo for scale.