Suborder:
|
Tornoceratina
|
Superfamily:
|
Prionoceratoidea
|
Family:
|
Prionoceratidae
|
Subfamily:
|
Prionoceratinae
|
Genus:
|
Imitoceras
|
Species:
|
abundans |
Qualifier:
|
ss |
Author:
|
Miller & Collinson 1951,p.460
|
Lower Boundary:
|
UMO Chouteau Lst. base, 354 million years
|
Upper Boundary:
|
UMO Chouteau Lst. top, 353 million years
|