| Different views of seven ammonoids from the Lower Triassic Thaynes Formation, Nevada. Scale bar equals one centimeter (0.39 inch). Called scientifically, Proharpoceras carinatitabulatatum. Photograph courtesy a specific technical document. |
| Different views of seven ammonoids from the Lower Triassic Thaynes Formation, Nevada. Scale bar equals one centimeter (0.39 inch). Called scientifically, Proharpoceras carinatitabulatatum. Photograph courtesy a specific technical document. |