TaxNo: 3435Genus Simmonoceras
| Suborder: |
Goniatitina
|
| Superfamily: |
Nomismoceratoidea
|
| Family: |
Nomismoceratidae
|
| Genus: | Simmonoceras |
| Qualifier: | ge |
| Author: |
Kuzina 1974,p.29
|
| Lower Boundary: |
RUN Kos'vinskii--Nortnichskii, 340 million years
|
| Upper Boundary: |
RUN Nortnichskiy gorizont top, 339 million years
|