Suborder:
|
Tornoceratina
|
Superfamily:
|
Karagandoceratoidea
|
Family:
|
Karagandoceratidae
|
Genus:
|
Masonoceras |
Qualifier:
|
ge |
Author:
|
Work & Manger 2002,p.574
|
Lower Boundary:
|
low.Tournais.--mid.Tournais. [Tn1--Tn2], 357.5 million years
|
Upper Boundary:
|
G.typicus--anchoralis-latus Z. base [0, 349 million years
|