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t-shirts annularia t-shirts calamites t-shirts fossil leaf t-shirts plant fossil t-shirts fossilized leaf t-shirts sphenophyte t-shirts pteridophyta t-shirts equisetophyta t-shirts equisetopsida t-shirts equisetales t-shirts pennsylvanian period t-shirts paleozoic era t-shirts paleontology t-shirts north american t-shirts mazon creek t-shirts

photographs annularia photos calamites photos fossil leaf photos plant fossil photos fossilized leaf photos sphenophyte photos pteridophyta photos equisetophyta photos equisetopsida photos equisetales photos pennsylvanian period photos paleozoic era photos paleontology photos north american photos mazon creek photos

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Annularia fossil from the Pennsylvanian Period, Mazon Creek, Illinois. Annularia is the scientific name for the leaf whorls of the horsetail genus Calamites.