Suborder:
|
Goniatitina
|
Superfamily:
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Gastrioceratoidea
|
Family:
|
Homoceratidae |
Qualifier:
|
fa |
Author:
|
Spath 1934,p.15
|
Lower Boundary:
|
Arnsbergian--Chokierian [ARN--CHO], 319 million years
|
Upper Boundary:
|
RUS Nm2c2 top;Biling./Canc.--Bran./Gast., 313 million years
|