.7" Calymene Celebra Trilobite - Illinois

This is a Calymene celebra trilobite from Illinois preserved as an internal mold in Dolostone. These trilobites used to be fairly common, but over the decades the quarries they were collected from closed one by one and they are hard to find on the market now. This specimen is very 3D and has been prepared to remove it from the surrounding rock.

Calymene celebra was named the state fossil of Wisconsin in 1985.

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.
Calymene celebra
Grafton, Illinois
Niagaran Limestone
.7" long
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