This is a nice and detailed 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: | St Clair, Schuylkill County, Pennsylvania, USA | ||
Size of plate: | about 80 x 85 mm | ||
Age: | Carboniferous (Pennsylvanian), Llewellyn Formation (about 320 Ma) |