TaxNo: 4825Genus Pachylyroceras
| Suborder: |
Goniatitina
|
| Superfamily: |
Neoglyphioceratoidea
|
| Family: |
Cravenoceratidae
|
| Subfamily: |
Cravenoceratinae
|
| Genus: | Pachylyroceras |
| Qualifier: | ge |
| Author: |
Ruzhencev & Bog. 1971,p.243
|
| Lower Boundary: |
DER Go beta--gamma, granos.base [P1--P2], 328.2 million years
|
| Upper Boundary: |
UTX Barnett Fm. top, 323 million years
|