| Top and bottom--Leaves from the extinct seed ferns Alethopteris and Pecopteris, respectively. From the upper Pennsylvanian Tonganoxie Sandstone. Douglas Group, Virgilian Stage--305 to 303 million years old. Photographs courtesy anoymous individuals at a specific web page. I edited and processed the images through photoshop. |
| Top--Leaf from an extinct seed fern Neuropteris. Bottom--Leaf from an extinct fern Odontopteris. From the upper Pennsylvanian Tonganoxie Sandstone. Douglas Group, Virgilian Stage--305 to 303 million years old. Photographs courtesy anoymous individuals at a specific web page. I edited and processed the images through photoshop. |