TaxNo: 5403Genus Trettinoceras
| Suborder: |
Goniatitina
|
| Superfamily: |
Schistoceratoidea
|
| Family: |
Schistoceratidae
|
| Genus: | Trettinoceras |
| Qualifier: | ge |
| Author: |
Nassichuk 1975,p.136
|
| Lower Boundary: |
U Morrowan (Bloydian)--Atokan[MOR--ATO], 310.4 million years
|
| Upper Boundary: |
U Atokan--Desmoinesian [ATO--DES], 308.6 million years
|