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Alethopteris is an genus of
fossilFossils are the preserved remains or traces of animals , plants, and other organisms from the remote past...
seed ferns that existed in the
CarboniferousThe Carboniferous is a geologic period and system that extends from the end of the Devonian Period, about 359.2 ± 2.5 Mya , to the beginning of the Permian Period, about 299.0 ± 0.8 Mya . The name is derived from the Latin word for coal, carbo. Carboniferous means "coal-bearing"...
period (around ).