| This is a nice and inexpensive seed fern fossil of the species Alethopteris serli from the classical site of St Clair in Pennsylvania. The fossil leafs from the Llewellyn Formation show usually a attractive silver white preservation. | |||
Location: | Petersbachm, Alsace, France | ||
| Size of plate: | about 229 x 134 mm | ||
| Age: | Triassic, Anisian, Upper Buntsandstein, Grès à Voltzia (About 245 Ma) | ||