Suborder:
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Goniatitina
|
Superfamily:
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Schistoceratoidea
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Family:
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Schistoceratidae
|
Genus:
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Eoschistoceras |
Qualifier:
|
ge |
Author:
|
Ruzhencev 1952,p.914
|
Lower Boundary:
|
RUS Miachkovian--Zhigulian [MYA--ZHI], 306.5 million years
|
Upper Boundary:
|
RUS Zhigulian--Orenburgian [Ruzhentsev], 305 million years
|