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TaxNo: 2882Trizonoceras berkhense
Suborder: Goniatitina
Superfamily: Dimorphoceratoidea
Family: Dimorphoceratidae
Subfamily: Dimorphoceratinae
Genus: Trizonoceras
Species: berkhense
Qualifier: ss
Author: Kuzina & Yatskov 1988,p.31
Lower Boundary: RUS Nm1a1 base, Hypergon.-Ferganoc. GZ, 327.8 million years
Upper Boundary: RUS Nm1a2--Nm1b1,Uralopron.-Cravenoc. GZ, 326.4 million years