Suborder:
|
Goniatitina
|
Superfamily:
|
Shumarditoidea
|
Family:
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Shumarditidae
|
Genus:
|
Preshumardites
|
Species:
|
gaptankensis+ |
Qualifier:
|
ss |
Author:
|
Miller 1930,p.401
|
Lower Boundary:
|
UTX upper-uppermost Gaptank, 300 million years
|
Upper Boundary:
|
UTX Gaptank Fm. top, 299 million years
|