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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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ibnkhaldouni | 
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Qualifier:
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ss | 
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Author:
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	Korn & Ebbighausen in Klug et al. 2008,p.92	 
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Lower Boundary:
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Holkerian--Asbian [V3a--V3b]  [HLK--ASB], 336.5 million years
 
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Upper Boundary:
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Asbian--Brigantian [P1a--P1b] [ASB--BRI], 332 million years
 
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