Common Ordovician Fossils of Oklahoma
Trilobites (What is a Trilobite?) :

Isotelus from the Viola Group.

Ceraurus from the Bromide Formation.

Cryptolithus from the Viola Group.

Homotelus from the Bromide Formation.

Ceraurus from the Viola Group.

Bumastoides from the Bromide Formation.

Brachiopods (What is a brachiopod?)