Name:   Fossil Seed Fern Plate Age:  Pennsylvanian Formation:  Llewellyn Formation Location:  Near St. Clair, Pennsylvania Size:  Plate is over 12 inches across This is an outstanding plate of fossil Seed Ferns from the classic St. Clair, Pennsylvania locality. The Seed Ferns are preserved as a thin film of white pyrophyllite on black shale. The plate has many, many fronds intact, and many are different sizes and shades of white. The Seed Ferns exhibit wonderful detail - the individual leaflets of the fronds are clearly defined. The fossils have striking color and contrast and are well presented on the large, natural plate of shale. This is a very displayable plate of Coal Age fossils from Pennsylvania.