Wikimedi'Òc

Large carbonate concretion in black shale (Huron Shale Member, Ohio Shale, Upper Devonian; ravine just east of the Olentangy River, Highbanks Park, Lewis Center, Ohio, USA) 5.jpg - Jsj1771

Cone-in-cone limestone (likely an interbed from the Ohio Shale, Upper Devonian; creek bed of an Alum Creek tributary, northern Delaware County, Ohio, USA) (17148386506).jpg - Ser Amantio di Nicolao

Mudshales (Ohio Shale, Upper Devonian; Glen Echo Ravine, Columbus, Ohio, USA) 3 (36542413831).jpg - Ser Amantio di Nicolao

Mudshales (Ohio Shale, Upper Devonian; Glen Echo Ravine, Columbus, Ohio, USA) 6 (35871382803).jpg - Ser Amantio di Nicolao

Large carbonate concretion in black shale (Huron Shale Member, Ohio Shale, Upper Devonian; ravine just east of the Olentangy River, Highbanks Park, Lewis Center, Ohio, USA) 6.jpg - Ser Amantio di Nicolao

Black shale (Ohio Shale, Upper Devonian; Lazarus Run, Delaware County, Ohio, USA) 1.jpg - Ser Amantio di Nicolao

Pyrite streak in black shale (Ohio Shale, Upper Devonian; Lazarus Run, Delaware County, Ohio, USA) 1.jpg - Ser Amantio di Nicolao

Pyrite streak in black shale (Ohio Shale, Upper Devonian; Lazarus Run, Delaware County, Ohio, USA) 2.jpg - Ser Amantio di Nicolao

Fragment from a carbonate concretion (Ohio Shale, Upper Devonian; Lazarus Run, Delaware County, Ohio, USA).jpg - Ser Amantio di Nicolao

Dolomitic concretion (Ohio Shale, Upper Devonian; Groveport, Ohio, USA).jpg - Ser Amantio di Nicolao