Geologic period: Ordovician
Pictured:
Zygospira, Streptelasma, Rafinesquina, Platystrophia, Conodonts, Batostoma, Constellaria, Glyptocrinus, Lophospira, Isotelus, Cyclonema
About this image:
The Ordovician seas were without modern fish, but life existed in a wide variety of forms!