TaxNo: 3786Family Berkhoceratidae
| Suborder: |
Goniatitina
|
| Superfamily: |
Dimorphoceratoidea
|
| Family: | Berkhoceratidae |
| Qualifier: | fa |
| Author: |
Librovitch 1957,p.265
|
| Lower Boundary: |
DER Go beta--gamma, granos.base [P1--P2], 328.2 million years
|
| Upper Boundary: |
RUS Nm1b2--Nm1c1,Fayettevillea-Delepinoc, 324 million years
|