Suborder:
|
Goniatitina
|
Superfamily:
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Schistoceratoidea
|
Family:
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Schistoceratidae
|
Genus:
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Schistoceras
|
Species:
|
sp. |
Qualifier:
|
in |
Author:
|
div. authors
|
Lower Boundary:
|
UTX Graford Shale base, 305.6 million years
|
Upper Boundary:
|
Gzhelian--Asselian [C--P], 299 million years
|