Suborder:
|
Goniatitina
|
Superfamily:
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Goniatitoidea
|
Family:
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Agathiceratidae
|
Genus:
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Proshumardites
|
Species:
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becharensis |
Qualifier:
|
ss |
Author:
|
Pareyn 1961,p.163
|
Lower Boundary:
|
GBY R2b--R2c1(metabiling.--superbiling.), 314.2 million years
|
Upper Boundary:
|
GBY aff. crenulatum--cumbriense, 313.2 million years
|