2.05" Foulonia Trilobite With Pos/Neg Split - Zagora, Morocco
This is a 2.05" specimen of Foulonia from the Upper Fezouata Formation in Morocco. This specimen is a perfect split and both the positive and negative impression of the trilobite are included. It's unusual to get such a nice split. The rust colored preservation is natural and due to the oxidization of iron pyrite which originally replaced the trilobite.
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 described species, filling nearly every evolutionary niche. Due in large part to a hard exoskeleton (shell), they left a excellent fossil record.