TED CLUTTER / SCIENCE PHOTO LIBRARY TED CLUTTER / SCIENCE PHOTO LIBRARY
Fossil fern. Fossilized frond (leaf) of a seed fern (Alethopteris sp.). These ferns were common in the Carboniferous and Permian periods between 300 and 270 million years ago. While they had fern-like leaves, they produced seeds rather than spores. This 300 million year old fern is in an ironstone concretion. Photographed at the State Museum, Pennsylvania, USA.
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