This postcard features a detailed photograph of a specimen of Isotelus, the official state fossil of Ohio. The trilobite is shown embedded in stone, highlighting its segmented body and distinctive ridges. The fossil measures 9.5 inches in length and was collected in Highland County, Ohio. The image captures the texture and intricate details of the fossil's exoskeleton against a muted stone background. The reverse side of the postcard includes informative text explaining that Isotelus lived in a shallow sea covering Ohio during the Ordovician Period, approximately 440 million years ago. The photograph was taken by Michael C. Hansen, and the specimen was collected by Dan Cooper. Additional information includes credits to the Ohio Department of Natural Resources and mentions the state's governor and geological survey officials at the time of publication.