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Suborder:
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Goniatitina 
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Superfamily:
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Dimorphoceratoidea 
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Family:
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Girtyoceratidae 
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Subfamily:
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Girtyoceratinae 
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Genus:
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Girtyoceras 
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Species:
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latum | 
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Qualifier:
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ss | 
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Author:
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	Ruzhencev & Bog. 1971,p.170	 
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Lower Boundary:
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RUS Nm1a1 base, Hypergon.-Ferganoc. GZ, 327.8 million years
 
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Upper Boundary:
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RUS Nm1a2--Nm1b1,Uralopron.-Cravenoc. GZ, 326.4 million years
 
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