Bilde nøkkelord:mazon creek
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fossiler, bergarter, monotont innhold, mazon creek, concretions, sirkler, eldgammel, forhistorisk, paleontologi, utvikling, forsteinede -
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fossil, stein, concretion, mazon creek, annularia, Illinois, anlegg, eldgammel, pennsylvanian periode, karbon, forsteinede -
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fossil, fern, rock, paleontologi, stein, bregne, blad, Pennsylvanian, paleoflora, eldgammel, karbon, anlegg
