Wikimedi'Òc

Ironstone concretion (probably Logan Formation, Lower Mississippian; near Nashport, Ohio, USA) 3.jpg - Jsj1771

Ironstone concretion (probably Logan Formation, Lower Mississippian; near Nashport, Ohio, USA) 1.jpg - Jsj1771

Ironstone concretion (probably Logan Formation, Lower Mississippian; near Nashport, Ohio, USA) 2.jpg - Jsj1771

Ironstone concretion (probably Logan Formation, Lower Mississippian; near Nashport, Ohio, USA) 4.jpg - Jsj1771