Ordovician Brachiopods Sowerbyella and Plectorthis

Here are some more fossils from Pennsylvania. These are Ordovician period from Lebanon County, Pennsylvania and can be found in the Martinsburg Formation. The first two are brachiopods called Sowerbyella plectorthis. Update: The last picture is a brachiopod called Plectorthis. The shell imprints appear brownish-yellow because of the presence of limonite (hydrated iron oxide).

The brachiopod called Plectorthis.

Pennsylvania Brachiopod Tropidoleptus corniatus

Here are some more fossils from Pennsylvania. All of the fossils are from Juniata County, Pennsylvania. The first two pictures are of the same brachiopod Tropidoleptus corniatus fossils but taken from different angles. The last picture is of a portial Mucrospirifer.

They are from the Devonian period and found in the Mahantango Formation.

Devonian Pelecypod from Pennsylvania

My friend from Pennsylvania left a number of fossils for me to study. Here is one that is a Devonian pelecypod found in Mahantango Formation located in Perry County, Pennsylvania. The rock seems like some sort of shale? The Mahantango Formation is named for part of the Mahantango creek found in Pennsylvania and is a member of Hamilton Group.

Maybe this pelecypod is of the genus Nucula or Paracyclas? Here is a neat web page on Pennsylvania fossils.

All pictures shown are of the same fossil.