The Pennsylvanian Period occurred 310 to 280 million years ago. It was during this time that great expanses of swamps, deltas, and lowlands developed. In these areas, huge trees and plants flourished in land that was often flooded. This is the area that later became coal bearing land. Modern ferns reproduce by means of spores, but this extinct plant genus produced seeds and is commonly known as a seed fern.
The Children's Museum of Indianapolis
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Paleontology -- Pennsylvanian
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