Suborder:
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Goniatitina
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Superfamily:
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Gastrioceratoidea
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Family:
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Reticuloceratidae
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Subfamily:
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Surenitinae |
Qualifier:
|
fs |
Author:
|
Ruzhencev & Bog. 1975,p.52
|
Lower Boundary:
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RUS Nm2a2--Nm2b1,Reticuloc.-Bashkortoc.G, 317.2 million years
|
Upper Boundary:
|
Langsettian--Duckmantian, Westphal.A--B, 311.3 million years
|