Cincinnatian
Bill Heimbrock's Ordovician Paradise, Cincinnatian Fossils of the Ordovician Period, Cincinnatian Trilobites, Dry Dredgers, Limper Geology Museum at Miami University, The Paul Sanders Fund, The Type Cincinnatian, Trilobite Fragment Identifier
Cincinnati Museum of Natural History
Online exhibits, including vertebrate fossils from Ohio.
North Coast Fossil Club
An active group of fossil collectors and enthusiasts of all ages and backgrounds, based in Cleveland, Ohio.