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TaxNo: 154Masonoceras rugilobatum
Suborder: Tornoceratina
Superfamily: Karagandoceratoidea
Family: Karagandoceratidae
Genus: Masonoceras
Species: rugilobatum
Qualifier: ss
Author: Miller & Collinson 1951,p.467
Lower Boundary: UMO Northwiew Shale base, 353 million years
Upper Boundary: UMO Northwiew Shale top, 352 million years