Suborder:
|
Tornoceratina
|
Superfamily:
|
Prionoceratoidea
|
Family:
|
Prionoceratidae
|
Subfamily:
|
Prionoceratinae
|
Genus:
|
Imitoceras
|
Species:
|
abundans aff.* |
Qualifier:
|
af |
Author:
|
Miller & Collinson 1951,p.461
|
Lower Boundary:
|
UMO Hannibal Shale base, 357.5 million years
|
Upper Boundary:
|
UMO Hannibal Shale top, 357 million years
|