| Suborder: |
Tornoceratina
|
| Superfamily: |
Tornoceratoidea
|
| Family: |
Tornoceratidae
|
| Subfamily: |
Tornoceratinae
|
| Genus: |
Tornoceras?
|
| Species: | orbicella |
| Qualifier: | sn |
| Author: |
Hall 1860,p.99
|
| Lower Boundary: |
Eifel.--Givetian [dm96:08,20] [EIF--GIV], 391.8 million years
|
| Upper Boundary: |
mid.--up.varcus Zone [17,00], 389 million years
|
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