This Specimen has been sold.
Enrolled Kainops Trilobite Filled With Quartz Crystals - Oklahoma
This is a really cool specimen, it is an enrolled phacopid trilobite that is filled with quartz crystals. It was left in two pieces which fit together and one side was prepared with air abrasives to expose more of the trilobite. I believe it's a Kainops raymondi but the break obscures to important details so it might be a Lochovella (Reedops) deckeri.
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.