Wikimedi'Òc

Fossil nautiloid shell with original iridescent nacre in fossiliferous asphaltic limestone.jpg - Tillman

Fossil nautiloid shell with original iridescent nacre in fossiliferous asphaltic limestone (Buckhorn Asphalt, Middle Pennsylvanian; Buckhorn Asphalt Quarry, Oklahoma, USA) 3.jpg - Ser Amantio di Nicolao

Fossiliferous asphaltic limestone (Buckhorn Asphalt, Middle Pennsylvanian; Buckhorn Asphalt Quarry, Oklahoma, USA) 10.jpg - Ser Amantio di Nicolao