This Specimen has been sold.
.9" Wide Eldredgeops Trilobite Fossil With Horn Coral - New York
This is a .9" wide, enrolled Eldredgeops trilobite from the Windom Shale of New York. It was cleaned with air abrasives and left partially embedded in the rock it was found in. The trilobite has been remounted on the rock, next to a piece of horn coral (Stereolasma).
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.