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TaxNo: 5782Genus Crassotornoceras
Suborder: Tornoceratina
Superfamily: Tornoceratoidea
Family: Tornoceratidae
Subfamily: Tornoceratinae
Genus: Crassotornoceras
Qualifier: ge
Author: House & Price 1985,p.165
Lower Boundary: Givetian--Frasnian [GIV--FRS], 385.3 million years
Upper Boundary: UD2F--UD2G:(subvaricatum Zone base), 370.8 million years