This Specimen has been sold.
Hollardops & Coltraneia Trilobite Association - Ofaten, Morocco
This is a natural association of two different genus of trilobites from Ofaten, Morocco. There is a 2" long Hollardops preserved near a partially curled Coltraneia oufatenensis on the edge of the rock. Neither trilobite has any restoration.
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.