Wikimedi'Òc

Cone-in-cone limestone bed (Ohio Shale, Upper Devonian; coastline of Lake Erie, Ohio, USA) 5.jpg - Ser Amantio di Nicolao

Cone-in-cone limestone bed (Ohio Shale, Upper Devonian; coastline of Lake Erie, Ohio, USA) 4.jpg - Ser Amantio di Nicolao

Cone-in-cone limestone bed (Ohio Shale, Upper Devonian; coastline of Lake Erie, Ohio, USA) 3.jpg - Ser Amantio di Nicolao

Cone-in-cone limestone bed (Ohio Shale, Upper Devonian; coastline of Lake Erie, Ohio, USA) 2.jpg - Ser Amantio di Nicolao

Cone-in-cone limestone bed (Ohio Shale, Upper Devonian; coastline of Lake Erie, Ohio, USA) 1.jpg - Ser Amantio di Nicolao