The Ordovician aged limestones around Cincinnati are chock full of fossils and one of the most sought after is the trilobite Flexicalymene. I have yet to be lucky enough to find one myself but here is a partially enrolled specimen that I recently bought at a fossil show.
The fossil comes from the Arnheim member of the Richmond Formation and was found at Mt. Orab, Ohio. The site the fossil was found at is regionally famous for how productive it is at producing trilobite fossils. It is on private property and only clubs are allowed in and that only occurs one a year or so.