Unknown Devonian Fossil

Here is a fragment of a Devonian fossil found in Clark County, Indiana. It has a pentagon shape on one side and remnants of a series of tube like structures on the other. When I see 5 of something in a fossil, I think crinoid calyx. It is about 2 cm by 2 cm in size and the side with the holes has about 24 openings.

Pennsylvania Cryptolithus Trilobite Fragments

More fossils from Pennsylvania. These trilobite fragments are quite nice. We have places east of Louisville that will yield Cryptolithus pieces but they tend just be the lace collar and genal spines and are black/dark gray. The following fossils have the glabella and the lace collar and are orange (iron?). The cephalon sizes range from 5-15 mm.

These Cryptolithus sp. were found in Lebanon County, Pennsylvania in the Martinsburg formation.

Update: The yellow-brown color is limonite (hydrated iron oxide-hydroxide).

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.