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Fossil nautiloid shell with original iridescent nacre in fossiliferous asphaltic limestone.jpg - Tillman
Fossiliferous asphaltic limestone (Buckhorn Asphalt, Middle Pennsylvanian; Buckhorn Asphalt Quarry, southeastern Murray County, Arbuckle Mountains, southern Oklahoma, USA) 1.jpg - Ser Amantio di Nicolao
Fossiliferous asphaltic limestone (Buckhorn Asphalt, Middle Pennsylvanian; Buckhorn Asphalt Quarry, southeastern Murray County, Arbuckle Mountains, southern Oklahoma, USA) 2.jpg - Ser Amantio di Nicolao
Fossil nautiloid shell with original iridescent nacre in fossiliferous asphaltic limestone (Buckhorn Asphalt, Middle Pennsylvanian; Buckhorn Asphalt Quarry, Oklahoma, USA) 2.jpg - Ser Amantio di Nicolao
Fossil nautiloid shell with original iridescent nacre in fossiliferous asphaltic limestone (Buckhorn Asphalt, Middle Pennsylvanian; Buckhorn Asphalt Quarry, Oklahoma, USA) 4.jpg - Ser Amantio di Nicolao
Fossiliferous asphaltic limestone (Buckhorn Asphalt, Middle Pennsylvanian; Buckhorn Asphalt Quarry, Oklahoma, USA) 10.jpg - Ser Amantio di Nicolao
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