Crawfordsville Indiana Crinoid Calyx Fossils

This picture is of crinoids from Crawfordsville, Indiana on display at Indiana State Museum. The four crinoid calyx that have been labeled and they are Aulocrinus bellus, Cyathocrinites multibrachiatus, Scytalocrinus robustus (Hall, 1861) and Agaricocrinus americanus. These crinoids are from the Edwardsville Formation (Valmeyeran series) and are from the Middle Mississippian Period.