This cast was made from one of the best and most complete specimens discovered to date. Some estimates put Isotelus maximus at up to 24 inches long. They were first found and described by John Locke in 1838, in the late Ordovician (450-438 million years ago) rocks of southwestern Ohio. On June 20, 1985, Ohio House Bill 145 designated the trilobite genue Isotelus as the official State Invertebrate Fossil of Ohio.
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