Suborder:
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Tornoceratina
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Superfamily:
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Tornoceratoidea
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Family:
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Tornoceratidae
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Subfamily:
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Aulatornoceratinae
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Genus:
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Aulatornoceras
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Species:
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sp. |
Qualifier:
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in |
Author:
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div. authors
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Lower Boundary:
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mid.--up.varcus Zone [17,00], 389 million years
|
Upper Boundary:
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UD2A--UD2B:(verneuili Zone base) [07,75], 374 million years
|