Fossil Oyster
Exogyra costata
Paleobiology
Paleobiology
Paleobiology
Exogyra costata
Fossiliferous Shale
Pterygota
Phacops africanus
Callianassa
Diacalymene marginata
Brachyura
Ogygopsis canadensis
Pseudogygites canadensis
Cryptolithus
Phacops
Eldredgeops rana