| Three mostly complete trilobites from the lower Cambrian Harkless Formation, Extinction Canyon, Great Basin Desert, Nevada. Called scientifically, Anabocephalus silverpeakensis. Photograph courtesy Frederick A. Sundberg and Mark Webster. |
| Three mostly complete trilobites from the lower Cambrian Harkless Formation, Extinction Canyon, Great Basin Desert, Nevada. Called scientifically, Anabocephalus silverpeakensis. Photograph courtesy Frederick A. Sundberg and Mark Webster. |