| An impression (mold) of an ammonite on a chunk of shale from the lower Jurassic Sunrise Formation, Ammonite Canyon, Nevada--genus is Pseudaetomoceras sp. It's from the mid Sinemurian Stage of the Jurassic Period, about 193 million years old. |
| An impression (mold) of an ammonite on a chunk of shale from the lower Jurassic Sunrise Formation, Ammonite Canyon, Nevada--genus is Pseudaetomoceras sp. It's from the mid Sinemurian Stage of the Jurassic Period, about 193 million years old. |