Suborder:
|
Goniatitina
|
Superfamily:
|
Gastrioceratoidea
|
Family:
|
Gastrioceratidae
|
Genus:
|
Gastrioceras |
Qualifier:
|
ge |
Author:
|
Hyatt 1884,p.327
|
Lower Boundary:
|
RUS Nm2c2 top;Biling./Canc.--Bran./Gast., 313 million years
|
Upper Boundary:
|
RUS Branner./Gastr.--Diabol./Winslow. GZ, 311.7 million years
|