Suborder:
|
Goniatitina
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Superfamily:
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Goniatitoidea
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Family:
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Sygambritidae
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Genus:
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Sygambrites
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Species:
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tardus |
Qualifier:
|
ss |
Author:
|
Kuzina & Yatskov 1988,p.38
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Lower Boundary:
|
DER Go beta--gamma, granos.base [P1--P2], 328.2 million years
|
Upper Boundary:
|
Visean--Namurian/Serpukhovian [VIS--NAM], 326.4 million years
|