This Specimen has been sold.
Bargain, .85" Enrolled Cordania Trilobite - Oklahoma
This is a .85" long, enrolled example of a scarce trilobite from the Haragan Formation of Oklahoma, Cordania falcata. It comes from the Haragan Formation near Clarita, Oklahoma. It has been prepared under microscope using air abrasives to reveal the beautiful shell preservation. It's bargain priced because it's missing one of it's genal spines.
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.