Wikimedi'Òc

Helicoprion tooth whorl.jpg - FunkMonk

Helicoprion sp. (fossil shark tooth whorl) (Phosphoria Formation, mid-Permian; Idaho, USA) 1 (33484858583).jpg - Ser Amantio di Nicolao

Helicoprion sp. (fossil shark tooth whorl) (Phosphoria Formation, mid-Permian; Idaho, USA) 4 (33484823513).jpg - Ser Amantio di Nicolao

Helicoprion sp. (fossil shark tooth whorl) (Phosphoria Formation, mid-Permian; Idaho, USA) 3 (34163954831).jpg - Ser Amantio di Nicolao

Helicoprion sp. (fossil shark tooth whorl) (Phosphoria Formation, mid-Permian; Idaho, USA) 7 (34163909211).jpg - Ser Amantio di Nicolao

Helicoprion sp. (fossil shark tooth whorl) (Phosphoria Formation, mid-Permian; Idaho, USA) 5 (34163938601).jpg - Ser Amantio di Nicolao

Helicoprion ferrieri (fossil shark tooth whorl) in phosphatic limestone (Phosphoria Formation, mid-Permian; Waterloo Mine, near Montpelier, Idaho, USA) 1 (34367874135).jpg - Ser Amantio di Nicolao

Helicoprion sp. (fossil shark tooth whorl) (Phosphoria Formation, mid-Permian; Idaho, USA) 6 (34254480436).jpg - Ser Amantio di Nicolao

Helicoprion ferrieri (fossil shark tooth whorl) in phosphatic limestone (Phosphoria Formation, mid-Permian; Waterloo Mine, near Montpelier, Idaho, USA) 2 (34367856855).jpg - Ser Amantio di Nicolao

Helicoprion sp. (fossil shark tooth whorl) in black concretionary phosphorite (Morris Member, Phosphoria Formation, mid-Permian; Waterloo Mine, Bear Lake County, Idaho, USA) (34327241886).jpg - Ser Amantio di Nicolao