Suborder:
|
Goniatitina
|
Superfamily:
|
Schistoceratoidea
|
Family:
|
Schistoceratidae
|
Genus:
|
Schistoceras
|
Species:
|
hyatti |
Qualifier:
|
sy |
Author:
|
Smith 1903,p.106
|
Valid:
|
Schistoceras missouriense [TAX2913 ] |
Lower Boundary:
|
UTX Graford Fm.--Brad Fm., 305.3 million years
|
Upper Boundary:
|
UTX Graham Fm. top, 301 million years
|