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TaxNo: 5403Genus Trettinoceras
Suborder: Goniatitina
Superfamily: Schistoceratoidea
Family: Schistoceratidae
Genus: Trettinoceras
Qualifier: ge
Author: Nassichuk 1975,p.136
Lower Boundary: U Morrowan (Bloydian)--Atokan[MOR--ATO], 310.4 million years
Upper Boundary: U Atokan--Desmoinesian [ATO--DES], 308.6 million years