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Fossil Ferns - Ptychocarpus unitus | by Ron Wolf
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Fossil Ferns - Ptychocarpus unitus

Fossil Ferns (Ptychocarpus unitus) in the Francis Creek Shale. Middle Pennsylvanian period, about 300 million years old. Wilmington, Will Co., Illinois. (Collection of the Colorado School of Mines Geology Museum. Golden, Colo.)

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Taken on July 30, 2009