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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Polonoceras |
Qualifier:
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ge |
Author:
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Dybczynski 1913,p.519
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Lower Boundary:
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UD2A--UD2B:(verneuili Zone base) [07,75], 374 million years
|
Upper Boundary:
|
UD2H--UD2I:(mamilliferum base) [12,90], 370 million years
|