Suborder:
|
Goniatitina
|
Superfamily:
|
Dimorphoceratoidea
|
Family:
|
Girtyoceratidae
|
Subfamily:
|
Girtyoceratinae
|
Genus:
|
Eumorphoceras
|
Species:
|
divaricatum |
Qualifier:
|
sn |
Author:
|
Patteisky 1959,p.49
|
Valid:
|
Eumorphoceras varicatum Schmidt 1934 |
Lower Boundary:
|
DER E2a--E2b, 322.5 million years
|
Upper Boundary:
|
DER E2b--E2c(Cravenocerat.--Nuculoceras), 321 million years
|