| Suborder: |
Goniatitina
|
| Superfamily: |
Pericycloidea
|
| Family: |
Maxigoniatitidae
|
| Genus: |
Beyrichoceras
|
| Species: | vallense |
| Qualifier: | ss |
| Author: |
Delépine 1940,p.63
|
| Lower Boundary: |
DER Go alpha 1--Go alpha 2 [11.00], 333 million years
|
| Upper Boundary: |
DER Go alpha 3--Go alpha 4 [13.00], 332 million years
|
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