Suborder:
|
Goniatitina
|
Superfamily:
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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
|