This Specimen has been sold.
2.5" Ordovician Foulonia Trilobite With Cephalopod
This is an excellent 2.5" specimen of Foulonia from the Upper Fezouata Formation in Morocco. The orange/rust coloration is natural and due to the oxidization of iron pyrite. This specimen is nicely inflated. There is also a fossil cephalopod associated with it.
Trilobites were a very diverse group of extinct marine arthropods. They first appeared in the fossil record in the Early Cambrian (521 million years ago) and went extinct during the Permian mass extinction (250 million years ago). They were one of the most successful of the early animals on our planet with over 25k currently described species, filling nearly every evolutionary niche. Due in large part to a hard exoskeleton (shell), they left an excellent fossil record.