These pictures are of plant fossils from St. Clair, Pennsylvania. These plants grew in the Late Carboniferous or Pennsylvanian Period and can be found in the Llewellyn Formation.
St. Clair is famous for the white appearance of their plant fossils which caused by aluminum silicate or pyrophyllite. This first image is of fossils are what appears to be Alethopteris (top) and Neuropteris (bottom).
The next image is a close up of the Neuropteris fossil.
Thanks to Dave H for this fossil specimen so many years ago.
The last image is with a ruler to show the size of these fossils.
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