|
Suborder:
|
Goniatitina
|
|
Superfamily:
|
Gastrioceratoidea
|
|
Family:
|
Gastrioceratidae
|
|
Genus:
|
Cancelloceras
|
|
Species:
|
crencellatum |
|
Qualifier:
|
ss |
|
Author:
|
Bisat 1924,p.122
|
|
Lower Boundary:
|
GBY cancellatum--rurae, 313.6 million years
|
|
Upper Boundary:
|
GBY rurae--aff. crenulatum, 313.4 million years
|