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- Mazon Creek Polychaete Worm Astreptoscolex anasillosus 12
Mazon Creek Polychaete Worm Astreptoscolex anasillosus 12
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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.