Suborder:
|
Goniatitina
|
Superfamily:
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Gastrioceratoidea
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Family:
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Gastrioceratidae
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Genus:
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Gastrioceras
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Species:
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listeri+* |
Qualifier:
|
ss |
Author:
|
Sowerby 1812,p.97
|
Lower Boundary:
|
Yeadonian--Langsettian, Westph.A [YEA--, 313 million years
|
Upper Boundary:
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Langsettian--Duckmantian, Westphal.A--B, 311.3 million years
|