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 | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Clutter, Ted |
Taille de l’image : | 2482 px × 3661 px |
Model Release : | Non requis |
Property Release : | Non requis |
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