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: | Sophia-Jacoba Coal Mine, 860 – 1000m deepth, Hückelhoven, Heinsberg, Germany | ||
Size of plate: | about 115 x 37mm | ||
Age: | Upper Carboniferous, Namurian (About 316 Ma) |