TaxNo: 281Simmonoceras atratum+
| Suborder: |
Goniatitina
|
| Superfamily: |
Nomismoceratoidea
|
| Family: |
Nomismoceratidae
|
| Genus: |
Simmonoceras
|
| Species: | atratum+ |
| Qualifier: | ss |
| Author: |
Kuzina 1974,p.30
|
| Lower Boundary: |
RUN Kos'vinskii--Nortnichskii, 340 million years
|
| Upper Boundary: |
RUN Nortnichskiy gorizont top, 339 million years
|