Foto tag:mazon creek
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fossiler, klipper, monotont indhold, mazon creek, concretions, cirkler, gammel, forhistorisk, palæontologi, udvikling, forstenede -
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fossil, klippe, konkretion, mazon creek, annularia, illinois, plante, sten-, gammel, pennsylvanian periode, Karbon -
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fossil, bregne, rock, palæontologi, sten-, bregne, klippe, blad, Pennsylvanian, paleoflora, gammel, Karbon
