TaxNo: 5206Family Christioceratidae
| Suborder: |
Goniatitina
|
| Superfamily: |
Schistoceratoidea
|
| Family: | Christioceratidae |
| Qualifier: | fa |
| Author: |
Nassichuk & Furnish 1965,p.725
|
| Lower Boundary: |
Langsettian--Duckmantian, Westphal.A--B, 311.3 million years
|
| Upper Boundary: |
UTX Smithwick Fm. top, 308.6 million years
|