Wikimedi'Òc

Isotelus maximus fossil trilobite (Flat Run Trilobite Lagerstatte, Arnheim Formation, Upper Ordovician; Flat Run Quarry, far-southwestern Highland County, southwestern Ohio, USA) 3 (15076202450).jpg - Natuur12

Rafinesquina ponderosa (fossil brachiopod) (Arnheim Formation, Upper Ordovician; Roaring Run, Warren County, Ohio, USA) 3 (44572420665).jpg - Lu Brito

Fossil bivalve in limestone (Arnheim Formation, Upper Ordovician; Roaring Run, Warren County, Ohio, USA) 1 (30545913137).jpg - Lu Brito

Rafinesquina ponderosa (fossil brachiopod) (Arnheim Formation, Upper Ordovician; Roaring Run, Warren County, Ohio, USA) 1 (43669198710).jpg - Lu Brito

Waynesville Formation over Arnheim Formation (Upper Ordovician; Roaring Run, Warren County, Ohio, USA) 1 (31611911268).jpg - Lu Brito