|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.
|St Clair, Schuylkill County, Pennsylvania, USA|
|Size of plate:||about 80 x 85 mm|
|Age:||Carboniferous (Pennsylvanian), Llewellyn Formation (about 320 Ma)|