| Here is an orthocone nautiloid cephalopod, genus Bactrites from the Upper Mississippian Chainman Shale, collected in the vicinity of Cerro Gordo ghost town; actual size of specimen is roughly 18mm long. |
| Here is an orthocone nautiloid cephalopod, genus Bactrites from the Upper Mississippian Chainman Shale, collected in the vicinity of Cerro Gordo ghost town; actual size of specimen is roughly 18mm long. |