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t-shirts alethopteris t-shirts fossil t-shirts fossilized leaf t-shirts medullosales t-shirts neuropteris 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 alethopteris photos fossil photos fossilized leaf photos medullosales photos neuropteris photos north america photos paleontology photos paleozoic era photos pennsylvanian period photos plant fossil photos seed fern photos spermatophyta photos

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Alethopteris (small leaves) and Neuropteris (large leaves, 2") fossils in the Pennsylvania State Museum collection. These seed ferns were common during the Pennsylvanian Period, 300 million years ago.