On a recent trip to Alpena, Michigan USA with several amateur paleontologists from Louisville and one from Chicago, we visited a local paleontologist Paleo Joe (aka Joseph Kchodl). This picture is of one of his trilobite fossils from Oklahoma. This fossil is known as Dicranurus hamatus (Conrad, 1841). It was found in the Haragan Formation and existed in the Devonian Period.
Learn more about Oklahoma trilobites in the Geological Survey Bulletin 123 Trilobites of the Haragan, Bois D'Arc and Frisco Formations (Early Devonian) Arbuckle Mountains Region, Oklahoma by K. S. W. Campbell (1977). Paper can be found at this LINK.
