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Mazon Creek Cyclus americanus “Water Bug” (Crustacean) 28

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2 Singles (not Pos and Neg)


Cyclus americanus “Water Bug” (Crustacean)

Francis Creek Shale, The Mason Creek Formation, Pennsylvanian, Upper Carboniferous, Cowder Flats, Morris, Illinois, USA. 325 million Years Old


See photo for scale