| Here is a bead-like echinoderm specimen from the middle Ordovician Antelope Valley Limestone, Beatty mudmound, Nye County, Nevada; it is a columnal from a rhipidocystid eocrinoid. Actual size of the echinoderm columnal is 5 millimeters in diameter. |
| Here is a bead-like echinoderm specimen from the middle Ordovician Antelope Valley Limestone, Beatty mudmound, Nye County, Nevada; it is a columnal from a rhipidocystid eocrinoid. Actual size of the echinoderm columnal is 5 millimeters in diameter. |