Suborder:
|
Goniatitina
|
Superfamily:
|
Dimorphoceratoidea
|
Family:
|
Dimorphoceratidae
|
Subfamily:
|
Dimorphoceratinae
|
Genus:
|
Trizonoceras
|
Species:
|
exile |
Qualifier:
|
ss |
Author:
|
Ruan 1981,p.210
|
Lower Boundary:
|
CNG Qixu 6 base, 326.4 million years
|
Upper Boundary:
|
CNG Qixu 6 top, 321 million years
|