Above is an image of a prone trilobite fossil called Bumastus harrisi. A trilobite fossil dates to the Silurian Period. It was found Chicago, Illinois, USA and appears to be made of dolomite.
The fossil was on display in the Evolving Planet section of the Field Museum of Natural History in Chicago Illinois, USA as of August 2020. Accession number is P11447. Learn more at the Virtual Silurian Reef Project web site.
More about this type of trilobite can be seen here:
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