TaxNo: 3779Genus Trizonoceras
| Suborder: |
Goniatitina
|
| Superfamily: |
Dimorphoceratoidea
|
| Family: |
Dimorphoceratidae
|
| Subfamily: |
Dimorphoceratinae
|
| Genus: | Trizonoceras |
| Qualifier: | ge |
| Author: |
Girty 1909,p.70
|
| Lower Boundary: |
DER Go beta falcatus--Go beta gracilis, 329.1 million years
|
| Upper Boundary: |
RUS Nm1c2--Nm2a1, Homoc.-Hudsonoc.GZ, 318.1 million years
|