This Specimen has been sold.
Three Trilobite (Kainops & Paciphacops) Fossils - Oklahoma
This is a 4.1 x 2.8" piece of limestone from the Haragan Formation of Oklahoma with three phacopid trilobite fossils. The prone specimen is Kainops raymondi, along with a pair of smaller Paciphacops cambelli. While these two species look very similar, Kainops has larger eyes, and more eye facets than Paciphacops. The piece has been nicely prepared with air abrasives under microscope to expose the detailed fossils.
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.