TaxNo: 5782Genus Crassotornoceras
| Suborder: |
Tornoceratina
|
| Superfamily: |
Tornoceratoidea
|
| Family: |
Tornoceratidae
|
| Subfamily: |
Tornoceratinae
|
| Genus: | Crassotornoceras |
| Qualifier: | ge |
| Author: |
House & Price 1985,p.165
|
| Lower Boundary: |
Givetian--Frasnian [GIV--FRS], 385.3 million years
|
| Upper Boundary: |
UD2F--UD2G:(subvaricatum Zone base), 370.8 million years
|