This Specimen has been sold.
Scarce Cyphaspis Carrolli Trilobite - Oklahoma
This is one of the rarer trilobites from the Haragan Formation, Cyphaspis carrolli. It's from the world famous Black Cat Mountain and was collected and prepared by Bob Carroll for whom the species is named. The detail on this specimen is simply amazing considering it's only .66" long.
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.