Isotelus - Ohio's State Fossil

Jan. 11, 2014

Ohio's State Fossil - Isotelus

Description From Ohio History Central -

 In 1985, the Ohio government made Isotelus Ohio's official fossil. Isotelus is a trilobite that existed between 430 and 480 million years ago. At this point in time, an ocean covered much of what is now Ohio. Isotelus is evidence of this, as it was a marine organism. A trilobite was an invertebrate creature that had a hard outer shell or skeleton. Two lines crossed the body of the trilobite, making it appear to be in three parts. Trilobite means "three-lobed creature." Isotelus primarily lived during the Ordovician Age. They were one of the largest trilobites, with some of these animals reaching nearly thirty inches in length. Isotelus no longer exist, becoming extinct approximately 430 million years ago.

Isotelus - Ohio's State Fossil

Ohio Trilobites

Fossil Collecting in Ohio

Summary of Geological History in Ohio

GeoFacts Series Listing by Topic

Two big trilobites have been found in the Caesar Creek Spillway. This one is on display in the Visitor Center. The other one is in the Smithsonian. Photo credit; Erin Shaw - ODNR Caesar Creek Naturalist


Cincinnati Dry Dredgers References

Types of Cincinnatian Trilobites