Suborder:
|
Tornoceratina
|
Superfamily:
|
Tornoceratoidea
|
Family:
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Tornoceratidae
|
Subfamily:
|
Falcitornoceratinae
|
Genus:
|
Gundolficeras |
Qualifier:
|
ge |
Author:
|
Becker 1995,p.613
|
Lower Boundary:
|
UD2F--UD2G:(subvaricatum Zone base), 370.8 million years
|
Upper Boundary:
|
UD5C--UD6A1: Sphenoclym.brevispina base, 364 million years
|