| This is a head shield, also called a cephalon, from a species of trilobite called Olenellus gilberti; Echo Canyon, Death Valley National Park; observed in the lower Cambrian section of the lower to middle Cambrian Carrara Formation. |
| This is a head shield, also called a cephalon, from a species of trilobite called Olenellus gilberti; Echo Canyon, Death Valley National Park; observed in the lower Cambrian section of the lower to middle Cambrian Carrara Formation. |