| Suborder: |
Goniatitina
|
| Superfamily: |
Gastrioceratoidea
|
| Family: |
Gastrioceratidae
|
| Genus: |
Gastrioceras
|
| Species: | formosum |
| Qualifier: | ss |
| Author: |
McCaleb 1963,p.877
|
| Lower Boundary: |
UAR Winslow Fm. base, 310.2 million years
|
| Upper Boundary: |
UAR Winslow Fm.--low. Atoka Fm., 309.5 million years
|
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