| A complete ammonite (an extinct order of cephalopod), called scientifically Psiloceras pacificum from the lower Jurassic Sunrise Formation, Ammonite Canyon, Nevada. It is from the Hettangian Stage of the early Jurassic, around 196 million years old. |
| A complete ammonite (an extinct order of cephalopod), called scientifically Psiloceras pacificum from the lower Jurassic Sunrise Formation, Ammonite Canyon, Nevada. It is from the Hettangian Stage of the early Jurassic, around 196 million years old. |