Suborder:
|
Goniatitina
|
Superfamily:
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Gonioloboceratoidea
|
Family:
|
Gonioloboceratidae
|
Genus:
|
Megatrochoceras |
Qualifier:
|
ge |
Author:
|
Yang 1978,p.158
|
Lower Boundary:
|
Yeadonian--Langsettian, Westph.A [YEA--, 313 million years
|
Upper Boundary:
|
Duckmantian--Bolsovian, Westphal.B--C, 310.6 million years
|