| Trilobites of the genus-species Elrathia kingii from the Middle Cambrian Wheeler Shale, Wheeler Amphitheater, Millard County, Utah. The specimens are roughly 505 million years old. |
| Trilobites of the genus-species Elrathia kingii from the Middle Cambrian Wheeler Shale, Wheeler Amphitheater, Millard County, Utah. The specimens are roughly 505 million years old. |