Suborder:
|
Goniatitina
|
Superfamily:
|
Dimorphoceratoidea
|
Family:
|
Girtyoceratidae
|
Subfamily:
|
Girtyoceratinae
|
Genus:
|
Girtyoceras
|
Species:
|
brainerdi |
Qualifier:
|
sy |
Author:
|
Morgan 1924,p.31
|
Valid:
|
Girtyoceras meslerianum Girty [TAX2170 ) |
Lower Boundary:
|
UAR basal--lower shale of Fayetteville, 327 million years
|
Upper Boundary:
|
UAR upper Fayetteville--lower Pitkin, 324.3 million years
|