Suborder:
|
Goniatitina
|
Superfamily:
|
Dimorphoceratoidea
|
Family:
|
Girtyoceratidae
|
Subfamily:
|
Girtyoceratinae
|
Genus:
|
Peytonoceras |
Qualifier:
|
ge |
Author:
|
Saunders 1966,p.43
|
Lower Boundary:
|
UAR Upper Pitkin--Imo Formation, 321 million years
|
Upper Boundary:
|
UAR Imo Formation top, 318.1 million years
|