This Specimen has been sold.
Hollardops & Barrandeops Trilobite Association
This is a beautifully prepared association for a Hollardops and Barrandeops collected near Ofaten, Morocco. There is some minor weathering to the shell on both trilobites. There is about 2% shell restoration on the Barrandeops (last pleural segment, right side) and less than 1% on the Hollardops.
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.