Alethopteris and Neuropteris Plant Fossils

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.

Acidaspis Trilobite Fossil Fragment

These images show what appears to be the front part of a cephalon of an Acidaspis trilobite fossil. It was found in the Kope Formation of Carroll County, Kentucky USA. The fossil was photographed under 40 magnification of a microscope and is approximately 1.3 mm long. This fossil dates to the Ordovician Period.

This next image is of the same fossil when it was wet.

This last image is of the fossil in the matrix. It is located next to a cephalon fragment of a Cryptolithus trilobite fossil. My personal experience is the matrix from the Kope Formation is best hunted under the microscope. This small world yields a diverse graveyard of sea creature that once roamed an ancient earth.

I documented similar fossils about 10 years ago.
https://louisvillefossils.blogspot.com/2010/02/acidaspis-trilobite-fragments.html

Geniculograptus Graptolite Fossil

I believe this graptolite fossil is of the genus Geniculograptus. The fossil was photographed under a microscope at 23 magnification. The fossils is approximately 5.1 mm long. It was found in the Kope Formation (Edenian Stage?) of Carroll County, Kentucky, USA. Fossil dates to Ordovician Period.

Learn more about this fossil at this site.

https://strata.uga.edu/cincy/fauna/graptolithina/Geniculograptus.html