Wikimedi'Òc

Ironstone concretion (lower Pottsville Group, Lower Pennsylvanian; Pleasant Valley Limestone Quarry, Muskingum County, Ohio, USA) 1 (30226085737).jpg - Ser Amantio di Nicolao

Ironstone concretion (lower Pottsville Group, Lower Pennsylvanian; Pleasant Valley Limestone Quarry, Muskingum County, Ohio, USA) 2 (30226086067).jpg - Ser Amantio di Nicolao

Ironstone concretion (lower Pottsville Group, Lower Pennsylvanian; Pleasant Valley Limestone Quarry, Muskingum County, Ohio, USA) 3 (30226086427).jpg - Ser Amantio di Nicolao

Ironstone concretion (Lower Mercer Ore, Middle Pennsylvanian; Rt. 16 roadcut near Trinway, Ohio, USA) 1 (24621692408).jpg - Ser Amantio di Nicolao

Ironstone concretion (Lower Mercer Ore, Middle Pennsylvanian; Rt. 16 roadcut near Trinway, Ohio, USA) 2 (38438091796).jpg - Ser Amantio di Nicolao

Ironstone concretion (Lower Mercer Ore, Middle Pennsylvanian; Rt. 16 roadcut near Trinway, Ohio, USA) 3 (37778691374).jpg - Ser Amantio di Nicolao

Ironstone concretion (Lower Mercer Ore, Middle Pennsylvanian; Rt. 16 roadcut near Trinway, Ohio, USA) 5 (26718140809).jpg - Ser Amantio di Nicolao

Ironstone concretion (Lower Mercer Ore, Middle Pennsylvanian; Rt. 16 roadcut near Trinway, Ohio, USA) 4 (38493807301).jpg - Ser Amantio di Nicolao

Ironstone concretion (Lower Mercer Ore, Middle Pennsylvanian; Rt. 16 roadcut near Trinway, Ohio, USA) 6 (37778648754).jpg - Ser Amantio di Nicolao

Ironstone (Pottsville Group, Middle Pennsylvanian; Frazeysburg Pit, Muskingum County, Ohio, USA) 1 (41559126814).jpg - Ser Amantio di Nicolao

Ironstone (Pottsville Group, Middle Pennsylvanian; Frazeysburg Pit, Muskingum County, Ohio, USA) 2 (40473322340).jpg - Ser Amantio di Nicolao