GEORGE BERNARD / SCIENCE PHOTO LIBRARY GEORGE BERNARD / SCIENCE PHOTO LIBRARY
Fossil fern. A fossilized fern frond, of the species Mariopteris nervosa. The genus Mariopteris contained woody liana-type seed ferns. These ferns were common in the Carboniferous period, between 300 million and 270 million years ago.
Model release not required. Property release not required.