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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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Edmooroceras 
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| 
Species:
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tenuicostatum | 
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Qualifier:
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ss | 
| 
Author:
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	Titus 1999,p.165	 
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| 
Lower Boundary:
 | 
GBY E1b -- E1c; DER E1 alpha -- E1 beta, 325 million years
 
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| 
Upper Boundary:
 | 
DER E1 beta--E1 gamma, 324.3 million years
 
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