|
Suborder:
|
Goniatitina
|
|
Superfamily:
|
Goniatitoidea
|
|
Family:
|
Sygambritidae
|
|
Genus:
|
Sygambrites
|
|
Species:
|
tardus |
|
Qualifier:
|
ss |
|
Author:
|
Kuzina & Yatskov 1988,p.38
|
|
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
|