Suborder:
|
Goniatitina
|
Superfamily:
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Gastrioceratoidea
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Family:
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Gastrioceratidae
|
Genus:
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Gastrioceras
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Species:
|
araium |
Qualifier:
|
ss |
Author:
|
McCaleb 1968,p.45
|
Lower Boundary:
|
UAR Woolsey--Dye Shale, "caprock", 311.7 million years
|
Upper Boundary:
|
UAR Dye Shale--Kessler lmst., 311.3 million years
|