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t-shirts fossil t-shirts fossilized leaf t-shirts mazon creek t-shirts medullosales t-shirts north america t-shirts paleontology t-shirts paleozoic era t-shirts pennsylvanian period t-shirts plant fossil t-shirts seed fern t-shirts spermatophyta t-shirts

photographs fossil photos fossilized leaf photos mazon creek photos medullosales photos north america photos paleontology photos paleozoic era photos pennsylvanian period photos plant fossil photos seed fern photos spermatophyta photos

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Fossil seed fern (Odontopteris subcuneata) from the Pennsylvanian Period, Mazon Creek, Illinois.