|
Suborder:
|
Goniatitina
|
|
Superfamily:
|
Neoglyphioceratoidea
|
|
Family:
|
Cravenoceratidae
|
|
Subfamily:
|
Cravenoceratinae
|
|
Genus:
|
Cravenoceras |
|
Qualifier:
|
ge |
|
Author:
|
Bisat 1928, p. 132
|
|
Lower Boundary:
|
Visean--Namurian/Serpukhovian [VIS--NAM], 326.4 million years
|
|
Upper Boundary:
|
Arnsbergian--Chokierian [ARN--CHO], 319 million years
|