"Cincinnatian Formation" This famous Late Ordovician series is characterized by myriad of depositional environments including shallow water, offshore and below storm wave base facies. The fauna represented in this illustration includes bryozoan colonies, crinoids, brachiopods, and orthoceratids along with the trilobites Flexicalymene (center) and Isotelus (right). Media: Adobe Photoshop. Click on arrows to get closer or view next illustration.