TaxNo: 2675Calygirtyoceras arcticum
| Suborder: |
Goniatitina
|
| Superfamily: |
Dimorphoceratoidea
|
| Family: |
Girtyoceratidae
|
| Subfamily: |
Girtyoceratinae
|
| Genus: |
Calygirtyoceras
|
| Species: | arcticum |
| Qualifier: | ss |
| Author: |
Gordon 1957,p.50
|
| Lower Boundary: |
UAK Alapah Lst. base, 333.5 million years
|
| Upper Boundary: |
UAK Alapah Lst. top, 326.4 million years
|