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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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complicatum | 
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Qualifier:
 | 
ss | 
| 
Author:
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	Koninck 1844,p.567	 
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| 
Lower Boundary:
 | 
DER Go alpha 1--Go alpha 2 [11.00], 333 million years
 
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| 
Upper Boundary:
 | 
DER Go alpha 3--Go alpha 4  [13.00], 332 million years
 
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