| The reverse side of the ammonite seen at the top of the web page, A Visit To Ammonite Canyon, Nevada, called scientifically Psiloceras pacificum, from the oldest limestone layers of the lower Jurassic Sunrise Formation, Ammonite Canyon, Nevada. |
| The reverse side of the ammonite seen at the top of the web page, A Visit To Ammonite Canyon, Nevada, called scientifically Psiloceras pacificum, from the oldest limestone layers of the lower Jurassic Sunrise Formation, Ammonite Canyon, Nevada. |