Suborder:
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Anarcestina
|
Superfamily:
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Beloceratoidea
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Family:
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Gephuroceratidae
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Subfamily:
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Gephuroceratinae
|
Genus:
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Sphaeromanticoceras?
|
Species:
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crassum |
Qualifier:
|
ss |
Author:
|
Wedekind 1913,p.59
|
Lower Boundary:
|
DER do one beta--do one gamma, 377.5 million years
|
Upper Boundary:
|
UD1L--UD2A:(frechi Zone base) [06,10], 374.5 million years
|